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 0xff6f40f4dafe6f47f3be87119f5a1450f952a09f4aef15bc9d2dca5b27a22646. 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/2d97bed6-ffcf-4650-b0d1-f29caa2f1129.json and https://artists.proofprofile.net/proofs/artist/2d97bed6-ffcf-4650-b0d1-f29caa2f1129.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 0x9d651e1ef4e34e7d93d83d9475d1a7be227b87e939ac4c406d730c5ad9f6a1d5. 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/TWC811104004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf330056671b419877d1eab011f0743c4cb0b47764ef34836538a8dbd4c1ef8d8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TWC811104009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb223e4c279472fe968084cf561fc7b11cadb4a9aee659f077eb471cf568f704c. 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/TWC811104005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c5a48165d6cbcd156c4e5ef7a15bcf1d774344861ccbc9399aab6dc6799daa. 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/TWC811403001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f78d0488eb7b10d09924435135de03597e6865bad324e181affe1739130b51. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TWC811104007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bddfb703de5ebfcbe80708b701606f0a313757e491004eb17fd2218884d8832. 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/TWC811104003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a579ecf9fa86711698ab70e3660be569f8896ae404bf186054795db9f97c78c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TWC811403003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16207d8c3f53dc5932e49d89747553e072d3d789b72e8fc56c963fe9eb220b7f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TWC811103002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8a92306dba9e31bdc9759b2647f833542a60751cdcb2b8f2731da7f74a2a30. 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/TWC811103001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6429a0ff2694ddf5a60c59412f20fd5ddd37b4e4eb9f8fc85fae8bdbae4c628. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TWC811103006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84722779348230cc7ecee8a5cda2b190da27ac6e635114c7c2b1909c66bba93f. 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/TWC811103011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e98ba410d0cb7d83c2c2f5b0fd722070c98eea3fe44d1539dc1eb8c2d188c52. 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/TWC810506008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6baf7c2670d659b4917e361a74448736b7c6d278e6a8bf08860df1efb34004c7. 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/TWC811103010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19cc75719c749275e55988ce353bb1e234437aa46043f64fc00e29b0019a33e. 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/TWC811504006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d45a0cf5ab410ed7fe646baa5eb281956ea01134a87821c26073167b771a48. 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/TWC811103004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c53d8bd398189cd5e55f8715ede7a1c65fe848e97653f08d86be17f0a9c99f. 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/TWC811103005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a028caa703d864ffdcf9254fb24f629dfd6804b752f983b8932561089174493. 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/TWC811403006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f25087f83ddf5dd342e976812cfbf8589b6d3c5326fcea8f98bb3eb4071fb7. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/TWC811403008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c83bac9198230784f069280dbfac762df5c7f3ebde8ad0b1818142e6831f330. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TWC811103008.
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 0x939973045628f5b7fad3056b59b8d739430eb15a5deadd2bed41d51ba22b7e2a. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/TWC811403004.