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 0x42f08bf1b7b16425fc3737ef8907135697b6b0e11aecc5fdf3b1b391347544d4. 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/e4f0108b-cd6d-4af5-8463-c7b499b444e3.json and https://artists.proofprofile.net/proofs/artist/e4f0108b-cd6d-4af5-8463-c7b499b444e3.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 0xf90d5fdfcc801f129b5b94eb8681bc6f4fc4a59fed03b89829d3aa0311567b8a. 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/CAZ700100553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0dd75a2226171ffa67aa848fb9b778ac92c31661514c54937700e9d0ae5c16. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CAZ700100554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e340b95d211c40d0ae1be326db7978eb0efa09cf8b003ee2b63b649ea18e3a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAZ700100560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e047dc83424c6b16823bf672cc0ef18e633df7c28f6063c76df963a11fe6be. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/CAZ700100567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14ecf0c56e2ffad02d95ab5613b5228d540a0d9df39b51cd961f8e8a9423ce6. 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/CAZ700100573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a57b4da0880db3d18aede5c7c24f35db412b61d8081f78a5c1706a77cb30b0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAZ700100682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5bf8326b4d87f275b267fdb609c9dd61a8ba0e951e21dde4133ee65e33d0d4. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/CAZ700100683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45050b2534aa8955f54946318dbd524420b345650daf1ca6e060744a881f33df. 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/CAZ700100692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x003e26c1662567c2ff77251cac0365cbdb11b9d95d82cbe4df95f44cc97fb800. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/CAZ700200443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e614bc3502ed4ee699e025d6d997c147a78ebd9ff1e47075c8f1c1bafe5cd2. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/CAZ700200199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c9d32413d0fe7dfe8487cede0c817950c74d0d11015de79a2d83867be46c01. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/CAZ700200200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b07ff6f0447c68867da9a940a99c78cd14185bbad4d4da13d19c4c8576ad24. 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/CAZ700200202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09b2169e67be2e0d8da33eb4f80d50a93a26ac5798bbdddba17a5f0a835d2c7. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/CAZ700400353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d389bf20d8aa0e5a61cddfdc4c58e7346a455e51ee133868220d98c5f0d997. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/CAZ700400354.
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