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 0x17d7a777e2dfe67dcce39e74f769dda61e312afcbf7e2122704f892819f9007e. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f5ea2a0a-f40f-45c6-8604-af545c8e24cd.json and https://artists.proofprofile.net/proofs/artist/f5ea2a0a-f40f-45c6-8604-af545c8e24cd.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 0x9e9506062992bbf05885b5209d42c0a01def5e86ff056efa7a3e52e160e0cfd0. 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/TWA559444104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f80ead91b73ff49f4a1b56633d3519b2712438feed1eeda4c77abfd58e630e. 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/HKB629401004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d3cc99d5564cdcd3965f5bf2d84ba4e7e7f5da80b57dd70a627b4f4d751b73. 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/FR59R2082868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2d5daba0399eb82cb3f33d84c2245fd5761e4f212b8f59215669da1528926b. 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/TWAH71906001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce252cf434cea9b1a4c5f6ed52716db709cde70ffccb352514066f20706de5b6. 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/TWA330304602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390f86dc05cc59a4e02e8771fa5ba2f167f877be8361b2623dc9a36c54ea5e02. 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/TWA330304603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9719849a7ea80a2ad3d192c85a19bfe99c2573ea472508be6e83c7cb51643d9d. 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/TWA330304604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b410701abd38d96210abb5630a9ffa9b39045975bba807d6ebf07e3040c0a7c. 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/TWA330304606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9fa69ee6eb7268bb80f1a9017e480dfd91c1f3a47ec1f33f78d44a88b38eba. 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/TWA330304610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22d7203e8a2b90ca262eba8ba0dd61a865eee3297273f2687ae7b6938593ef9. 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/TWAN79020002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b1fba55b825ad62d49dea9dd079cdbff4ae57bfeddb43a57094f1de34c066b. 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/TWAN79020004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c5b9c2d90e9a5366e76b88cc8ea855d834d9c06b0f14a3b4f28590f2ad63ab. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TWAN79020012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea425d27723c9448c46cdd31fa7c432eb12a9e9a0fcbcfb48d5def305959e69. 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/TWA330303601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c404436c33cb08438a4b39a7c003f04a0b835c9c525e71a086fe7a40abe7652. 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/TWA330303611.