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 0xd25083e6596311cc0d582e3154b96d9322094a194253b9143721d28808b0e893. 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/bc41c83a-c083-4e4f-a169-e5ea6145c488.json and https://artists.proofprofile.net/proofs/artist/bc41c83a-c083-4e4f-a169-e5ea6145c488.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 0xce03473ba0372acf37f6616164c6f7c8c6292c7d967782e5ec193ada780f9752. 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/USLZJ1443320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30a64dc344064446a45d34d3714c2c44c10ad6d0486ad43eb85258e2dee310c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBKQU1963247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26eb1b6054b39c62b08a0a44d9af70e372e72d0fc0146cd92df8bcc7946cc5f1. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/GBKQU2148261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768b413a9e6ea6bd52860813a79c06f78cbcaccc1befea1661e8ed7cc4d00f2d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/GBKQU2148262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aafdeeb9394e426d127e574b7f0f6dd6f9622dba46167711e55bf10a4c1d287. 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/GBKQU2148263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x189e59b02c376c88f7eeb18473a87bbc8c567af14fefb97b8ecb84078ceec9a1. 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/GBKQU2148264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe752de1a7094f9865fc47b6bb7e6e3e03713bf15971884fe7f0efb2477b3caf9. 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/GBKQU2148266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5e69b35f1e895940bc8ffcc506c5893832e95b2af59783cefb2ba716b75c9e7. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/GX3Q92327239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6046b1c90f7a79e210ffdaf84bc8c767e1d645ff122d3e5abc5f4bedc0176b. 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/GBRKQ2344807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd836b345b580896a527881973c7c807f7265d4178b1696264d0cf712d515c1fc. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/UKXN22332694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35666b01b4523fecf41ae7f9b1b0359bbd92598138ef7b226dbf6da011bac116. 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/GBMA22339035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164612187b795b80cceefcac6b8e1ea50e9e57929ffc6cfbbca5ded5ce9c76cf. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T21:49:45Z), 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/GBLFP2486492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bf8d8c891f84c0cb86b3b00622eb2064a89f3ff4de2c3d3842b7f13429d404. 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/GBMA22442703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c51f617c2fbf794fa430d6a1a87cadd4946f893e9b265755426b04908ecfd6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/MXD782500150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0f0abe7b21289c99579e52f5d375a62951d50214f4fec679ed038cc1129623. 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/UKU932521925.