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 0xb172827ea4a6938fbde07d611623308b4bb7527a5636c7bbc969368d454093b8. 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/a7e933ff-8cca-4e10-b5a7-6e195da337d0.json and https://artists.proofprofile.net/proofs/artist/a7e933ff-8cca-4e10-b5a7-6e195da337d0.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 0x5bc74a538720241e3734c431b2b48feb6fa83d92229b502f618894bb9c7ea2ce. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/IDA141700912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d03a86ee47751b87872c13220a5f3a2a366f964bc1c8ec510e9c45edc32e46. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/IDA141700914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ea245a12e33b30d01ab94b1c301e1b182c014a578e7cdce5bef49c0ad3cfe6. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/IDA141700915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d678fb1af6ab86ca1711a279c06b7b8f24d54281b95d1ed43d756522ca542ba. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/IDA141700917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa436997c194d0ad4b770245e1ba94fa09ab0f151a649a01ec8ec342c72e0e29d. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/IDA141700918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2647843ac159ed8aa337eebcb530a25bd310a0cafdeed624f059b45e6c2e1e82. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/IDA141700920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f118e6e69d0a1fdcdbd5f135a17dbebf84cbfbe904cabce3be1abf0f949175. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/IDA141802433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9474cf5bcf66ecaca230ddb4dfebffc97739aa06269011b588fc7b9de76dad86. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/IDA142101951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe175a6ecbed1765297012e8491f12283516ffdafcc70c961df3285f8178df4cb. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/IDA142101950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482d85949bb1d845a8122c0a2f9c1fe33cf2f92c733a75ad6c9b142b5c9405b0. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/IDA142101949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00bc324941cc81c62dc974f8dd843f6f6ba01be8a5333a602227547afc074927. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/IDA142206185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d43a82b868b6ff2966e69d113d012a3e79d1bed43646f1278c6905ba7a78a9. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/IDA142206186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60cfc0c2294bdb88bba81608941b319fcadfdd6e2007f72708fafe8dcc37a0b0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/IDA142206188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fba129d204f6efeaab616db65011d38e536d29ae85b8ade10e91e9133a8d11. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/IDA142206189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b4d69c827c94f3fa3f1007b4efec7ba78fd5b5bcba9f4cf44851e173452ecf. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/IDA142206191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93aeb8fd262898620a4d7455cd3632dd67c70e011f85cee80748c56666aba365. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/IDA142206192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9b39fd0afe14dd79953e76bfcb4e3daeae4f6bc4d03eef3fc2350b11a47555. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/IDA142206197.