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 0xb3e3dcfa97b9c3e357e286d8e54227261a9c83ce32de1f4eeff201e5369f3d50. 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/e856f931-fc10-4b24-8fc2-68bb260e7d64.json and https://artists.proofprofile.net/proofs/artist/e856f931-fc10-4b24-8fc2-68bb260e7d64.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 0x0233bf726b1d41fb17db079994c7b5b19e7d6f126d6012a013dbdb3a72d22868. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DEQ022007247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8842cd08b3d3040e42ed88ee3b7e9487c0c94b1b1610fea0dd1b8b812e3a37. 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/USANG2121772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3f13764ed638506bed73312c6a77ca3cafe708d017e7cc66514f7118f7fa04. 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/US3DF2258827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f89db805afb26d2d3dcda771f163a1d3ebacb5e9676063ea13a17a37153f9a. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/US3DF2281586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df5dc17f48b65c413ff2c8b0a4ee2e1601dbb13b2fa711f3417ae0e1532c91c. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USANG2202040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9fc6e0fca1bb2d00955b41250ed05dba1f9b110ed9e92c9a848e2677b6eedb. 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/QMANG2206799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72412e1276e64423780cc3f0aacd14cc52515703536c5b157688908bea003472. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QMANG2207069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b2c7892331ed5c3cc9da7367dd82795a0bbd757f5416bed59f393c472b10e2. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QMANG2207070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5430d346dc5ed92e139f07be4a9ab8dd21b0c89fb5eeee8aa39224151ee40d3f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL4YD2300173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad9f7558b99046dbfc7c0ea4e383d09d54ea0c8e8f4c8810f60bb91c108ee93. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US3DF2420470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc59e5887fe341f71a92e674e631c62704c269641b5024c05112ade4b9c85b18. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL4YD2200208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911a599f4b00d00e144cfa0f6994174d7b91bc2ee4a85daad1b85276e8a3070d. 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/USANG2193328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x462eebac258cb871f5a4642a4646ab67fb7f80ee2310d9eb1b572688ff615b80. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QMANG2255011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde6bfdd63dbbbbca882ae5e2a78dcc811f61f3551b5ae5ffbd2b29cc8117770. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/AUMEV2391608.