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 0xebf9740caa5f9d6b76aeea6afa98ce7387d1628beb8a7b8b0b5190fe635ccda7. 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/30e4737f-3106-4087-8ce6-8e71f233418d.json and https://artists.proofprofile.net/proofs/artist/30e4737f-3106-4087-8ce6-8e71f233418d.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 0x3dfeb3f68d6e8021eb3cd1260f1c10b5c2985dbab0d8a03a953e9e5bcdd16198. 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/NOFCB8202010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2941bcec032a175a4b9ffda84de6cfa3a0329d85eafaa894cfb852229f93d8b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/NOFCB8202020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099bf2f8771a1106e89b1e2e632ea8a2c69a6a22aee67cf237e9f35339de494e. 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/NOFCB8202030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b20d5a75451591a399f9d8f66ec2847b2998b71c3e97097a69c9d60180453f. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/NOFCB8202060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca87e5f108a3dee4f0515ffa971d510269e8e7d6941681aeedbc0121faeeafd8. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/NOFCB8202070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6249a19870feeb20f64b89de4eb8a98b3c1706f77b0f01840cdafa52db0cfed. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/NOFCB8202100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380a31128bfe3e6f0ab957082b86f6b3b368cf767109b1a407200af38e3d12f8. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/NOFCB8202110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528aa7442cea53ed263effa95ef36ce8b9ff7fb6724b67b8f0d3265f6ebcdcc6. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/NOFCB8202130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfeb3f68d6e8021eb3cd1260f1c10b5c2985dbab0d8a03a953e9e5bcdd16198. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/NOFCB8202010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b20d5a75451591a399f9d8f66ec2847b2998b71c3e97097a69c9d60180453f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/NOFCB8202060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380a31128bfe3e6f0ab957082b86f6b3b368cf767109b1a407200af38e3d12f8. 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/NOFCB8202110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62f0e932e8581e768a297edbf25d5fb3f0f36a5f816c09357f47dd84fc4c740. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/NOFCB8306021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f29ae02359a334cbc294120067fb1fcca2c0c66c08040574aa3e602fd228872. 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/NOFCB8306030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62f0e932e8581e768a297edbf25d5fb3f0f36a5f816c09357f47dd84fc4c740. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/NOFCB8306021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7516f265d0b06b3b45e673cd29794d1c19a6f7ddb8aa7b0e1255df86f60f39e0. 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/NOFCB8701010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7b1a0a76a855fd9c4730a9a3ace98d6b78e392ae921fa672f6f90d9be87f5e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NOFCB8701110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7153f1461ffc366a0fbd9f8bcc1fc6b1b4fd5ee10e8cd2756052e249f2ff9e. 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/NOGTH1314020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7906070ec9ed62fc4b0dd9e829add670824ed3256cd1a0a344c6bddaca22f31. 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/NOGTH1314130.