1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd781d2d12609f037913f77452a7db6aff13f978a059022eb133356a7f6397220. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55d70a2b-57ec-4f6e-b13f-ea4053586944.json and https://artists.proofprofile.net/proofs/artist/55d70a2b-57ec-4f6e-b13f-ea4053586944.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c778a7633bb0c2069b52a6c105bbc6c96f782e6d70f414b706b40377c80146c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SGUM71900084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefdbbf1a8158bc95d6af3c06b80f759dd5b0958b977d1945d70717cd900dfde2. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUX42101004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4319bb8fa234f686655568374a5e2618e9a10abff6472f490c233f49f0242b7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUX42101006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04c6ccc23a5dfc032f835a28eb30401f5fee13ccb860393ffcd1f3bc1fc1bc7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUX42101008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a43d29079bd2df18a50cf72af285ec3cb3fa355c7f89288a4128ae05f98e160. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBSV51900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0313bdd1d4a0dab29b6c07819cac3ef8369686df2a427f619f9c953691ff639c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QM4TW2295780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72951a789f5f3bffafe33d0ee9d982e34f584130970e0581b6316463efa27f8. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f0fe1a9dccb1374820a6b43863bd05d5aa7490c7b7cd9c97deead16264fe8e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4adf190468f8cdc0d3e31923e88bfe614e88ec6c3cbcc9f85a63987765a8584. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0914721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012902f5c12f1a6ec56cb2dc56dcba247af2bfd10807530f15845c73aebc5821. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b39272d6f3971a9d9d62c7a59152bece380a75b05d7e01cb48761727ccacfb5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc584cb2821456484fad4f7b4af2cf6e6b82dadc549b7e0a4400c3d256243cc88. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a0ca3ef6984b07c361495da7f5c5fce5a277c0de4a9c12eec274652ea4cf00. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012716893d5bebf174b050956f9646b67875b8b16e504603c9ce37b0b5915985. Chain 2 (Bitcoin): anchored in block 957029 (2026-07-07T11:17:55Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2acb6ffeed53ae682efda185542a7a5b632aa7349456192d07adfc6a10c5e7b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334e7f3abc4d489bcb499aa3fe5b65ed398b1e3c9591923257943cc0621441cd. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b64874eb9aea224950f64481b0260941be5ffc4a6df13dca2a831eb5773b66. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac366a34af24bb87391105622c84eeb3e46325c7ea4b11db01f6c2e22cd0904. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747211a94af9d4c81db73ad50546b4b654baa644ea950a0a300171605a8007ad. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d6cb40adcb51c3c80ffa4e43ab511162ed3a67430fb6d75fd630c1a724cfae. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c2ec317a54436d4cabb84a3b161a42bc859d1f200915f9cdf982bfae901b30. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660a8e4b8d06e9dc927cc8485e2765bcf2867a3bbf7cc196e3980608756cc339. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8d48927f41c05f8ac0cb32dcf4a41a0ba3dbf176c98ec269aa65126114eb15. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb270b2488ac23b2ef462169739ab7cd3a13b40f4ee0af8cb7776670e9ed047. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0915421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6956d5efd21a5dc0a6141d9c6f62367966a7f637dde1f319d2d778c5c4ec31c8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY1300077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f45cfd550248956e30cf759a03106ef1e146dbf18866777832b5c81b9c2c120. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY1100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd8cd14c9b0bc47ea1b0f75766a3b8b1c6ca8df2645cf590b2fd7afb5f0de44. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY1300255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c82a2de1643aea080a8764aa02d761ef6db025d99b32ee38df16cf5c3912ad. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY1400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0214731c83bb6f1baba9ec22161ca304a462f7b9b7939c980632f469d8c44d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY1200091.
Everything's Different - Calibre Remix 2015 Master
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe948aa3b7f7bb3e85bcd2d99fffa1bb10db1dbaac9554732b10679209d87cff4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0712503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd372481e1b7118cf824e0155122bc34e63558ce4244128f8361b56dab9588212. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY1200066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1490624b95d0e3d80415e94bf89075cf6506161d9c219f5569a11fa92df434ab. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0474003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d33f99da5a663e4ae8d65c33fef39716cee4634eb5dd5fcff4cfb25784969d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY1500114.
System - Matrix and Futurebound Remix 2015 Master
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6341c98d689f30a423f4c4150cabc3784459240000a6a5b6762cf279ac12bd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY1500110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c071179424bffcb99bdc42fc75d58a5c6ee9d384557cb98a6ac07d73d1f1a22. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY1205292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e5beff4ed6d345dfa76b0bc48184cff74531420d721a0308741468cfff3d80. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCJY0477001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699de3fb26e4dd78e3acd499cad4399ea263b829528f1964bfb5cd1b0fd80ffc. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBZPZ0900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5e5d9c03c0510b2eefdff3e0e087f930edf0903377c6f5b06a26ca1e0ab604. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBZPZ0800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadb626f28bedae42f285fbc80b86b1a880ca0a330b873a5bd142b4d97e311d8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1731759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ea9e04f2dee7bf4f841e0235be4a9edb98fd57bfecf0b3b307482a123c0455. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1731764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf2ce9f22aa60a72860531a98bb0d08047d975ebde4f1c0edf040fabfbddbfe1. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBHF0930402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6909394fe0608882c96db409d842a76c624f00272c02c7a185cb8c2247b70f6. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBHF0930403.
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch