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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66905ca7acbd473328fe65970eb8db3997c01cdf2dcbb3115afea0794d77c207. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c01b9f17-baeb-4a94-b317-1de17fb215d7.json and https://artists.proofprofile.net/proofs/artist/c01b9f17-baeb-4a94-b317-1de17fb215d7.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a2424d0fd1b80313a836f63822f294960e09230862c6db8d6c7a4cd9e20867. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZS642320956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe61f58830d2a16428568ff3d7b22624eca2ee65cdb801b467ea6cda061f5b90. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZMHN2334362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9400f1b909ffc2966f00ed6a20e66cb48e67169cf040585527622a2513cd1900. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QM42K2305470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318cf566cdbd11af8cc5c5fa24712a17b05a870f0dc491595304f83437aa4b37. 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/QZS642309896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7ed25a67ad1293924b41faf09ac7414b3c21bbe3b4d08655a2a7400115f40e. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZMHM2318538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe42a8dcd486fee8640e09b31d2e3e928d77bb3df4e04f2c2ead829b28c1a02. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZMHN2355857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd85ea89fabffcf7010e7b3ad5b9e672d709931568573cf0d363f057be9774d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS652362510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbbc2daab7d3e9509bfb670cfa8c0e48350a0b4e1d838552cf6eee6b477c489a. 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/QZK6M2442720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5573f50f288456f2bea105d8c8d3fd112f014f0012b70504f0d547ec3322a0e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZK6M2442721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43fee7d10501c35b9e01c21691ada70081c81d7ccd5dee68231de15dc992255c. 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/QZK6M2442722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b50bc981c2b97767acc2c435d1dc6916fe2f68f2e75dfa7d132c01b5bf0d785. 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/QZES72410594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98db1e0b1e6b3d73c75bf41546a62001f11dac7d50e233ee760d223c7731c98c. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZWFF2320456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ec4ceeb12f1909bb5c115880f03382626010fc70edb55bb8c0e8e2afea5aa9. 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/BH4YA8269928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa32d110c29d1bdf1d2ef961d7477a23d095eb65b419a706ef32ed434ab552098. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZK6L2398458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac60ecbf932b73b37e478c053d37806aa58c1cb04703596d7c908c35fa8f3db. 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/QZK6P2350862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b5c790b48859148060a733f1be8bcab3e348430ac33542368da8d4d7b92baf. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZHN42376344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa623680a9fc405e81e4b84e8e328c03e99ece4572968a0137c5d5a0e284fcb18. 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/QZMHL2373659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489c7fd0d78cbfbf6be6ddb2fae6fe04f569ac54e7786bd622e59e31bfcb10ad. 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/QZMHP2336100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6598e51cc3a2d58ed526085ffbd12ec33de4520965b6cb9159fe9033a6cffa0. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZTAT2255668.