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 0x64f4d3a4b19cf208870ff34a59ce76071a86ee4dbcafe6ef96a897861d2bca1d. 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/7e412e59-f53d-4cca-bff5-0fb285c54835.json and https://artists.proofprofile.net/proofs/artist/7e412e59-f53d-4cca-bff5-0fb285c54835.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 0x375dda82ad3b4a971f4c4cb36426a5a83f8ce1f4b8c858fb8cfc640bae79f190. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/USCGJ2376366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69c7bf194b73fc0446e1f6e56831fa91683dec3f169ddec80bcb94ea88daee5. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CA5KR2405541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c6ab34fa634dededf3b0491e4b6e285a1b5aabbe582768a5b57490680e0c7b. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QM4TW2472558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96e2f73daad6df7d38f360bb5800573d134da98d4d6a7ae1d2398a09a58ad20. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEH742406297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70229884388d86931f6755cdb2f9bf353460095e53bd1741e76bae6b31ee3f1d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DEH742400369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa314a78a5ed16b8b65cc3a68d5249908bbccc6fcf3c1d7cb683675c26ee9054a. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/DEH742413907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0516ba27f0d92ef8f8c0de41fdc91b256157b97d1349fecd32cc2c26fce33780. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBKQU2462793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ed1c7a1560bc1e3468e6b8e5ea097c503fdaf7bb06120122ec9d25428222d6. 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/QMBZ92438103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef78a546913c70b2b726dcb5740d7a7abdc05144d0e2c9bfd92ea758a2f62d96. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/QZNJY2492314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8158eae81aad2197d673137014f27d21f9cc2503a9092986a5364ba9bdd72c. Chain 2 (Bitcoin): anchored in block 957830 (2026-07-13T09:15:55Z), 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/QZZ8A2417378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e5494fba4f54b3d5d3d14e301887c22895b97376349eed1ae070a4bd516639. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZTPX2452834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee72ed90516f49f266bb35c219558089d057b46d9a6bf095cb12abbeb7f50a7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CH6542463713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b74b9fc025ee18181683fe5f3adc52270e827a0b8586c7a9db4b478b70130c1. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/UK2X22400538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed6a507b253515553ee3ff610e5aa9e255092c3a1d2b34905c9522af60b5a48. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/DEH742440302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x718be0435b8eab08b4eefc2221527bcca19b2d2d70b0a76673a1ed270536ed35. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZES72566845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c054d4d4f5c4a1648d3cb693cdc677263fa89f7448b1ee68f5848944993f9a. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZES72569251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c6228e3961319bb2d4b8a4ccdea50be9cf882f4ec2c625e3b4fcb4655ed3ce. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ8A2412493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33d2564d31241faee0fa69816832b6c8b4a03c2d5ced27d570f2c59c5fb3aa5. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZTBD2504174.