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 0x155f4146e1641e58efe5b4e3acba4f7476b23dc58558262a40be4e41a1b4d5b8. 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/1bc87b83-5684-491b-9b73-eb2a2083db54.json and https://artists.proofprofile.net/proofs/artist/1bc87b83-5684-491b-9b73-eb2a2083db54.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 0xa60d7fed8ad4f3de3a95ef12abe9610aacd29cb99c074fc9e7967a10d35294af. 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/QZFZ32203297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24543d4b93bf27e8eceadca3bdc6b845fbcd899eb4a468bfaa40637d90ee0b4a. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZNWS2247005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa207c0357324c1bb163a29eee3c37ae0234ead90d2b809c141e730cdcb8ce95b. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZZEC2322065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a978e98b3069fae793bb07e2dd1572112e7e4a57f8357a9d779cd4a3b04314. 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/QZWV32361132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9607760ffcff1bedfb80979117c0478a15b844ab794acab9309bd17b63790f35. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:04:16Z), 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/QZZEC2318496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa207c0357324c1bb163a29eee3c37ae0234ead90d2b809c141e730cdcb8ce95b. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZZEC2322065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc705638b248d4d32494ff3aac92abe9919da97a12bcb44798a419e152e75b057. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T02:26:54Z), 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/QZNWR2322311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702e5d1cce04f930ee93b69d0c90ca4b8a35b59838fce2393a538e937bcebcab. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTAS2223966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c626ca877cfcee8cb02b5f256a034b72f98a24466a9e3657b0781335a90be3. 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/QZWDD2491191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc023bf857c9eaf070892dabd0cfcd7791bb052ddd97347828f568dec2056f3. 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/QZWV32446095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbe0d1fbe756ac4a63cc6509f1ccfb0d998be10cc575aba840f87060535cde2. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZTRX2488992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b64dc751af01f821889ba2a8cd9a39e5134689033b3ad909437770700f0a71. 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/QZWV32464065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565f37b8a57d5f19bb43e7ed6c6694c8a307b497b8052eee09ad1f3156fdf5e5. 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/QZ5FN2499370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149b74242c47c7b7550969af443d1d72f449ce570b5f71556f4237d3c6c16bdd. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T03:53:36Z), 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/QZTV32448196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c626ca877cfcee8cb02b5f256a034b72f98a24466a9e3657b0781335a90be3. 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/QZWDD2491191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7cc82665d0175ea801a2596a130621ff8f86f596f20c026007d28b068b1798. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZZ8B2475791.