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 0x9d857035671c7c4e0a88883ed8aa5e4ee721d5d045b9ba8044c797e9bb732198. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d221d7af-d28f-4fba-ae3c-2ad663575d1b.json and https://artists.proofprofile.net/proofs/artist/d221d7af-d28f-4fba-ae3c-2ad663575d1b.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 0xf00517da3c6ef2c170b4e50bca40b5e4242dcbb9764e341512fc159a3b3a7f8c. 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/CZBK22219001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e06cb533976e5a2a7526df2b1388230f1124cd9d151815ef7d48ea540fb6c5f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CZBK22219008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a339a88f0f1dca1dde0351d710916140befd4ecb5d551b901cf9c9cd17b549c. 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/CZBK22219009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565e7f5c22c2a4aca4a7b395433c8a21059e5727f97fb3bfcaced18b2d7449cd. 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/CZBK22219010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cf7c497d971c89e76ed7c2da819f9ade605f3d5d8dc32215f19284140c25c1. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/CZBK22219002.
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 0x6fe579be6335f1cf8d9bf0afa33609afd2e9de0e4b0880599bc88875074d0402. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CZBK22219003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2267cd37438a4767da1b28b9325f090a8fe77f7f1c38222357c96b41f7ba14ea. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CZBK22219004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e598f29f9ca6e516999a4b7e6bb76b40545ab472a52d342ce55b9cc77a8f6c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CZBK22219005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea598a9455bab25ad25d643b4c62de3f5d5ca44a6d046a73a970f5bb994071f0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CZBK22219006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa7e3e57f0e30116129d646974794217af4b1b4cbb5265401ca32e4b93a0e82. 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/CZBK22219007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c62249b7a0a2899f395b9d629d7ab2a01ca59dfe6c577908a318794b5032455. 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/CZBK22250002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97e016aece732228c8303138d68548c1367976c6cec5f1e346856bef6e7b55c. 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/CZBK22250003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a2d83af2baa677a27688ee252c9d3a15a100e9c70dd6e8ea0b364f002c7b49. 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/CZBK22250004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1a5d6a4e0e895ca322f96c1e682a4712b9844662af41393a132ddd35c7a6bd. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/CZBK22250001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c633cf3dff5832f4e1fc1d304e71e040d947652e713382b1fe7942aa781daf. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CZBK22250006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bcbf1170d4d12aa1065fb3a6ac1ca3de533b4aafac6f9e5155544cf0d4e90a. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CZBK22240008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79be57515ee788093189b8d7457003a37bffaffeb113a8ee544ce57dd21753c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CZBK22240002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908991cab1efe39d6633c624524018e9a3d9ccbd13b5ecb49bc9bb2731b49d41. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CZBK22240005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638ed25bedaa0727cf8aaff42ec30baa4743cfe5d4c3f395c5801d284810008e. 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/USHM92171563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffc4f2d380312b6e71e1016b22466cfe15b0e88bd0b7b7142cb59b123ab509c. 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/USANG2174858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6647898219813a82edf1ffbe916ebf7eac1a859f289e7dc5ae800f2f89d23c1. 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/USANG2174860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e36a7b2ef7e78b9e7e18535ab1071a66665abb809cc06a7becbc3c2786ec48. 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/USANG2174864.