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 0x953863337ba9109d108f2c28832e2397d0d7c7654803a404dc7c19a35b1d1038. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88f0d87a-1946-4940-905b-3b637ab61f31.json and https://artists.proofprofile.net/proofs/artist/88f0d87a-1946-4940-905b-3b637ab61f31.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 0xe1d087db621e29f6179fc66bcd3c3faa8be048c3217bc9f3a8419f23a851f2e8. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), 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/TCACB1454381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7b0c328eaf090147589aad1c7d25fbf95c6bdee5c063dc80603779a1f8b435. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/TCABO1319062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3171c2fd20650d4396debb69201269c7a64697e7b60700bd1dbc6626aa63b302. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCABT1496630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe19e04a11416109e0abf372381d9a049454befc10e8526414e158cacbc8b6513. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCACB1483799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dcec9debc3a31d76f38cb7a5946b7743f1537df1a444c7d719235ae64c8502f. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/TCACC1464864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f7d00cd84cf48982f2386f3ffe4077bd0188547f228053bbeff8346d6a581a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCACC1464882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753563a12a90ae5b641229d7af1a1ddd2b8e4476172f57d3279d6af57b600600. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), 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/TCACK1564529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbe88f8e93a911cc3e62f50d2e70751730d8015bb00d37e42b7de6ce985de30. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCACK1564523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16e7c22d949bc8da0251d9df60f784658d3c4bb18d8cbf41c7def0ef049ff38. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/TCACK1564526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8797f79aef4ac88c1bb2c70072fbca390c93e2a1d761907f38fad7d08ac7d09. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCACK1564540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b4bf90752f18454c54693b03033a278d19ca40622bb1dea8982cfcbc7cf63b. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/TCADF1729312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334dfd074af8b6486c07f1e2e3790ef445f150f129f08258bdb86918dd9bf2be. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCADF1729331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186e572c58d872c9b250d5f3f9bba8b6dc1119d39fd6be061970f375615d4871. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/TCAGA2276323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb2fcb3f1d50158e568dedda370ad84918ee2c5558e0fa4586ceba0e004ce02. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAGA2276328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21cedbf2a698df9d233552135d976ba549d6aaad5955f6009a481062b34cbf71. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/TCAGA2276457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72441013473520581237fdd822f43725e07c5d270f5342132ed16576643d346. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/TCAGA2276465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb930b113f378202f689216e110467b1b4fdd1ca108d837f5cd2439374e2786f3. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/TCAGA2276471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6cd931d8429968dc8599df3b9dc2e28f80825bc0c14f0d921ecf6d9d88bacb7. 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/QZHN82178466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe987df36c047b68d599f95d1f568ad58d78e29ddea17a65b2fb2caa0ee1d1b5b. 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/QZMEP2175230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345cf94528021b8c7d0a39252915b5af288978e7ef34591bacbdbd25bad72eea. 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/QZMER2191853.