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 0x6db01ef1f412ec6826550341541183fe170ab2138e4273efb51003c1a0f7ca41. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/059179d7-ad9e-4325-87c2-2bcc82939e13.json and https://artists.proofprofile.net/proofs/artist/059179d7-ad9e-4325-87c2-2bcc82939e13.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x120e63d436f69b3904a1e17debba6e0c82e6d1763e16f42b6873100a743d214b. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TWDB51900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b395a033179159dc1b43684b0a854212deaf62c4c8ae31cfe024df5cb47bb4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWDB51900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e72801248b7afa37e9fa84add2acae9b3e0448eb3dc2f2e0fc1ed59e88434a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/TWDB51900021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652c35f04cb349ec99af0cb356f60007ca78bc09602a8c348231d5a563649b12. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/TWDB51900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6e900e57e73ab0e9f7ff5d0b443426c43789eefe1e708c4ed08f5f039a94a9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWDB51900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea77614eb8fd161ec44dd447357b4a3d2833f52504a4553078e09778ec4e67a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWDB51900024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f74a85038069731a2847aa4fe2bf80ce7e82cdc9790e4a59c60849c99c7f8ad. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TWDB51900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x199db49ada39a9496bce1358b1f3b22967b3295fbdc82e42d8275d0395dde561. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWDB51900028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69dc3b4773627e876d0a3158117dd7eefec05105467f4d331c665bba5c83d911. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/TWDB51900031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e8a6ffb430fd105e900dcc98300f6da3ab784378cceacb4a1f988ffad7b27a. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/TWDB51900032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19a33b7108bba2773776689fdcc4b2fb245cfe3d22d52be48ff89e894236e4e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TWDB51900034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64507e350ab699f2bcf7b0172413264730a7336fd451d820c7c082dace2428c7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TWDB51900035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bc46c649f2e9eadc254e50075ad4d7da204acf9e4d48c1b3e0243eb27ee071. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/TWDB51900036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138de5c63a9139d94c6aad7b6ada65e1ad1275a54bd34c40cb3044bbb03315b0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TWDB51900038.