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 0x50bd777c9ade2755b3eb0b8301909d00aa7827e18319a187419848d597b4aec9. 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/5ea9b104-659e-48a8-85a8-b295d1abf836.json and https://artists.proofprofile.net/proofs/artist/5ea9b104-659e-48a8-85a8-b295d1abf836.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 0x1be97fea4afe8034671ab803834c1e52dc17fbe03d1af9ff64a086d545cea818. 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/QZNJW2455152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bdf2ac8e14bc4a862e3606858408a29651ffb0604f556e0e9dc175bc507868. 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/BKF5C2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d0fba9bff756041e2ea7ee158399b91342fad8f88417ab9b59a3b58332db48. 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/BKF442400202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1175ef6920087f276981d914dafa2b37aa89e00aa473f82554a01453e9dd04. 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/BXJ3W2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2296be6b05d7f8b8e4be876bae5a3fe77b81893b0ca6d8f10af6917cbe9eb14e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BX7AM2100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51489c799841cda8d488894c4990b1e30b2cfccd18f3937691ee2ecc67ba6305. 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/BCQAL2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679afbc6d6a5ebe96e4887687e1012dff09bda9e2778f87d3f4e7237298d1efa. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZNJY2359366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6501e3a788fe5193dbbf490fc11de15d59bc9968f16b81a15780c0af47ea2b8b. 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/BC6M22300054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf72b1866a35ca3c1b06485f3cefb061a2037c26fadfc3a9ac4e0a8ba5e216ecd. 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/BX85Z2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20447c358ac26baa869e3b5e7e012852d53a3cea60da237dae72f651a811e2cb. 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/QZNJY2323912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcdbc5fbf27e27c7dac4ce98751f7010a09bb4368fb6204bf931351df2593f2. 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/BRRGE2400415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0b57d095e4cc939cad376b4a32ca869f4acd94cbc1182e6b4a101b4ca78f91. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BC8182300221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871d79b5622dc702e7c748fc6dcdf9926c2b9588b84594c129bb6743c74f5924. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BC8DD2200217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568b8720a363faf41a341f9d54bb656c2814b35d6b63407033754528e083278f. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZW9M2232078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f03d43da07782d9a4d8eb97a5fad41cf1d3ccdc645e3e7f1108763384c8ee0. 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/BCNWM2100074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954601acbd354cd39e5a2d35b117d96c89a0ab84f8d10c511bb4a35a18e1a905. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BCNWM2100042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e92174ec131110cd54ebe76fb183241cb9dfdb6a29b69f4463ddb6412b4ea0. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/BKBBL2200002.