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 0x7c6c403332377a0c4f10ca3cc16d9137d9d36a4149ba2959198ea468097598c4. 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/18653a4b-4a66-457e-91be-081222281da5.json and https://artists.proofprofile.net/proofs/artist/18653a4b-4a66-457e-91be-081222281da5.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 0xa9afc8efafc575f0979a22c87139a364ae2e47446631329d8dafff6dffe95d2a. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/NL1MZ2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe5b982daaecf19ef981f470d44bf75f01685886ff9e74efed8073f7c7ebb25. 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/NL1MZ2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe553d515affc2fcdf9d43ca23728ccd0d9abaafb24fa5cc0d14a25e2ce2b3e3c. 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/NL1MZ2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca0736d7ed07755e1907e98ee7b1f08bf5981c71c2a690c2031bdaaa5e32b17. 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/NL1MZ2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38781d8191f687f22ffc9544697c9cdb5f5b01b98e52580b35db8b2b08fb9261. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NL1MZ2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f49b32a3647e9f5003830f7ad952d2cac794f509ff5fc016e886028f76cca6f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/NL1MZ2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d63da1af90af5face9505069fa6b7be8e1b8621559f5e8ef919c20797c1815. 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/NL1MZ2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55adf44b003ef62fdce7cff9025272216b09c7561c4f17a8ba28dddb468e225. 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/NL1MZ2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa7d26c57df5132f6d0ab0b1d6a2f9c6cc7dc23d4cdc66d8d98a287e39de53f. 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/NL1MZ2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcee01bfcf094dca6911202b0396683eeb891c5918f4c84e71d12f8b37aaf7a1. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NL1MZ2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9d0fe8c8ae43a00fa383fb0acf49ed262821cf9dc36707d8b946b4a12079ac. 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/NL1MZ2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a73c85a43b9fa24be16406b7b63223df1919f2543b0f888115d08fa5919aec. 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/NL1MZ2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33f8733e7eb8b33514b7246455d7d38c164685228bccf38138129718a427af40. 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/NL1MZ2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66397044197f06eb55d3e04d928376f57b350d6f6f6d561064b6ebdabebedc4c. 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/NL1MZ2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4044fe0213e0f0b506adfa1fb07c99b4fc94b7e03a25095a7259ecace14760. 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/NLSB72400546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f86b39428e688a3aece41a0d3973b100dd951b3974f158338b0077fbe883e2e. 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/NLSB72500207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4044fe0213e0f0b506adfa1fb07c99b4fc94b7e03a25095a7259ecace14760. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLSB72400546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d2ad71497304de16efaf145ed9e87087707459f5fde516b22ed2ec9ebb6d19. 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/NLSB72500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ba3f2bf5d4c90181009ee970583fe3798dfa47bebd23948e6e6b9343864254. 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/NLSB72500208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1dac45ae7d6c6e369d2f8fa2f0b6196b166cb100ba334dd462f83ab1a6d824c. 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/NLSB72500104.