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 0x3991ea17300feedb41d92e019a7b5a50da4c00becacbe61babfbbd815b55110d. 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/a18a0706-e756-43fb-8fa4-a470fcc060a6.json and https://artists.proofprofile.net/proofs/artist/a18a0706-e756-43fb-8fa4-a470fcc060a6.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 0xa97c11ab5d5f2169dd04676ee08cf4a7ba19afbe2fa09d11176af2e314f5cedc. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/BCO3C2100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f3424c14d9dc48416bb229a3d0734281cbd6acfb67eea62c8016be38cc8928. 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/BCZVF2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545df70034f68935df0caa972495934ba03f422d681b7456fe1d2f942e935786. 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/BCZVF2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75251251a6010932dbb7428cedb0050e6f28a4445f78ff0d6c52b020b289683d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BCO3C2100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00af4e77cdadd0ff6bd4030859b27f6ea43ea0713e689a0cc3da7003f3e72e33. 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/BCZVF2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0dd5df064ed3423c32cfd6020e5ab710e7af2c49966757ce911dd5f180ccfc. 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/BXO722300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c9cad18e4364d429f392d5d7a27c816e6a9ca25a72e1456b94d5b5d8d200e2. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/BCO3C2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07f5ed660e63e4134b20898412b8c69931162712b85d7b8ca15dcae651fd150. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/BCO3C2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720b4345071a3449711c0586ceeff265801c69693519f554ffa30cb3e2c6daf5. 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/BCO3C2200031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972a22b778346a48d516532e0e1c4c486b0b8e48a21afaf35a1f30fde2e2629c. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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/BCO3C2200017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73445e81fde2d036fb574c278aa1f6b7848aa33c990a0ff39670fe6f31f9a4bd. 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/BXVDX2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4632c7612bb7c7e00ff7a0ef77a32bce2865dcde7f86fe1cf4e70808e2ecab48. 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/BCO3C2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b24b144bd526a5c47d6145b17bfde1ef5f1ec4b1cf662f5585e60cf33d3631. 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/BCO3C2100036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70897e64698496748cec46b781c1a1cbdd64db7d76f54be493cc5782be4062a6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BX52E2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb07f5ed660e63e4134b20898412b8c69931162712b85d7b8ca15dcae651fd150. 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/BCO3C2300002.