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 0xbe8bc9b5a7c4d11d3e87b2b798dfe5d37b7cc1243833ab46cd40ecdfac8ef518. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8cd399b7-f360-4ecc-b8db-94d072db141d.json and https://artists.proofprofile.net/proofs/artist/8cd399b7-f360-4ecc-b8db-94d072db141d.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 0xa14d1f444515a5c565b44e24f86e762b0aab789029b483936658475fae14377f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHN82472362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db9d85f7ae620bdc70767fe2899e47eb46abbf0e4c9831095708015deda7740. 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/QZHN32348638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1bc3ed2f80bbe1f529953a4220b4eba7733805e4a9f473ca58370ab9bb0dc99. 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/QZPLR2331383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e4bbf98587db20fbb1b2ade37c37e8b5cbaa8a12dc8752887e63a5594c937a. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZHNA2480721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704a1b1b9746fd025b8ea0f635d8a7bf6d805d36e3362b6a9e29f6ba6e113c70. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZTB82419359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3564f9e12b8f4c5991ff4429d2d8e4ebe5fc7047ee500a49ac0cc1e7f4d479f2. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZWFH2404852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682eb36bd1885e193806bfd47e9b5f9bf62881e4a490102007314d698ff0a69e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZZ792457630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917f745c5e3004f32e91cdcba1200629d93f6117f111b859fb6806e252389811. 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/QZZ7U2493893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1373ba82d40740245bc3fe14c7f31d77e8ea2d48cd9a82ec6c560aa2dfaa3f9b. 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/QZWFP2567896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ce745fa0ff9c89f40ee2267886f4487c13da8ca9a24afe161b1b97e9d39fd9. 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/QT3FC2565817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef22ab0939effae55443504cfa01af9d0341dc828fdacafeef163a0867aa7fbb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT3FG2570004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2784edc78c104c40d41774000d786633a2e18fdc2a68b5c6085c6f595f54302. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QT6EC2512574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e995b368367f2482467341ebd71289b830a6d33127680e7f76553049fe209ab. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QT6EC2512575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39055e7e3417b1b5934c9bad0f00c1207bb591576f0efa1ef4a41e969b0d0aca. 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/QT6EC2512576.