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 0x2a5140584b69e2cee3aba002abb70d54186a176c0da9bc3cfd34dc5110dd1e70. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/457dc78c-d237-43e9-af8c-551431ed6006.json and https://artists.proofprofile.net/proofs/artist/457dc78c-d237-43e9-af8c-551431ed6006.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 0x17c3c13e65a47142a75c634660330ead35d6d07badedbf414224b7486ef51725. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/USHM91826298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324f157b5c00a45cd28ec5177eb22ea34b50fb8fd03a5222e12d67b612d171a3. 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/USHM91826299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b3d66aba691346a68e168632a801e299cd4c2a8805d861119d81fa3930aded. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USHM91826301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26e674b78bda596ff307520b7148c15351549ca5633c508b518c60e7246eecc. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USHM91826303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54c548cc4722d22a6c347664a32b5405db5e9729f6b2004250536b776f843d1. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USHM91826304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20072d3da0e71bc120d46822437e652f07fc31ba10c3fdbed79aed96e67564b. 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/USHM91826305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77d4868f320b90c3007c5c49ff260225ea5225c59c79526a5b99a0c105c93e8. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/USHM91826306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaad8fda076904fc5c259da302c6c7959fb6f92b16162a0d46ad8ec8f0322541. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGH1916649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7346e3325e9ecffbacde74ed70a37b3113e53afdac330f90983147f38fd170e. 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/USCGH1916650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f0ceb6bb838e4e570a07609d4ffefa34a8ab22486a1408695abea7a32d03a8. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USCGH1916651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe967070d5851fb4dd301a0187315fdafde89566056c77a111170dfb0e460046e. 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/USCGH1916652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032a28c9a3286a7eb3302783389158eaf4d8c95c5cd0ae29b529d8554eefbf07. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USCGH1916653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d62a40bf8b48b0d591464c6f8589ba9f04bc8d4a94caf91f3d7f2c7c35807f4. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USCGH1916654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd090ad821ab48f3876319d7d54021e9db0bacdc0c671e78ae19edeebef406851. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/USCGH1916655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2660633e5926be325ec3ebc7ba5f04310d01688b5f521487ecddf0b9bb14c8. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/USCGH1916656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b77f345ff7c3af5ff224fd69bff1eda2a1028b447d4353dd704de85e1e7bf1. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USCGH1916658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce48e2bde781ac99ff9abdcd2d79fcdfc640bf5659e62688b2bb9d950866d02. 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/USCGH1916659.