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 0xabcd09103679949be2adf39cae0aded02fbd2f2cacb61c2d76318f6766dbfd23. 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/33028200-87fd-4228-851d-91e9729774bf.json and https://artists.proofprofile.net/proofs/artist/33028200-87fd-4228-851d-91e9729774bf.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 0x3c6c66248801cebec9b5db7798882816e8a67a1ab01d79c107f408f2502a24c3. 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/QM42K1820241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf90f2df53e80240c1730c27f06ba3e160ad4056b1dd7b7d0f96c74e93435eb84. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/PLZ631990065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2863190bb591885422ec8981e9c17844582da3119bdada5bf4d758cc4e8ee22. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/CALVP2062669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0215c4a23fed7ac8502631fc72acd5e3f520d291d18f931fb502e45c296e8b53. 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/PLZ632090026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df35ad518f1c36230e21c5e79184f2740360b99d3ff682fb0288cab94ad6533. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/PLZ632090032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afc7b3e2be3b8365f7b72ec852f4eb3a5a6c9ae9dbd14cb775535b021fb2be8. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/USFUE1900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b6ab8445cfccd52b028933a08f213be69025fc36858e0229c309d3c6bebd9c. 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/US3DF2226896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f8357066ee08a4cb98f97bcfaf9b273ea6c6a7b8dd4df7f973acdd1f837701. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/NL5WB2200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ba8af7a8c6630d1d39106c6637ee4c5da6ae5e7c47763cde5a5efd08f61534. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/NL5WB2200068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c201705453540ded9f9701b66192f17f02fd8bb1e04fd466d0c8347b9de3fcb. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/NL5WB2200069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c563df3717f9835711baceae47454a4e71490358433c0e801f5d2dc7376d42d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NL5WB2200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e98c6349a125aba0a0ba2c02096fb62d82f8c689466ebb436911157800d8886. 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/QZTV32380796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2271a1de3c5c25d743909eb8dd87f940852df195ea9213a13859809ab0bab16. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZZEB2371935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e9d9764bb77b8d9bf0c605e5123f83e1926e85a9a7d0ba12b7a72e088b45c9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GBRKQ2455154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb11319b0338260264476da1f00e6c69fcef28aea445fa108a9197c672343eea. 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/USLZJ1888276.