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 0x95236cc41127a0b4d403a3b7fe7c3abfc029788b15df0262013a74bd04a5c01a. 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/57a7a07a-d774-408e-9454-3ab8051b3422.json and https://artists.proofprofile.net/proofs/artist/57a7a07a-d774-408e-9454-3ab8051b3422.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 0x2c4b8046c7573fd79d596c4709c1ed2fbb5c196fe6e99e985af17bb58236a1cf. Chain 2 (Bitcoin): anchored in block 957834 (2026-07-13T09:42:16Z), 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/QM4TX2126180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x079ed5baf86eadb818784d11eccec886f87dbc972becaf11ed22beb11ee320de. 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/QM4TX2126181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d2ac74838defb128398f3d508fc3ec5a6e3fc82666a3f9bb2306afa681f86a. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:44:01Z), 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/QM4TX2126182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c0b0ae9bee78d31b0cba8ea5458e78292ed4ee091f977200b964d89f5ac065. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QM4TX2126183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0dde20615dae5e0d04e32ab34e9a0155f5679c1d8b7033b67f42b08cef23128. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:15:58Z), 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/QZNWX2137006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd112f1d77a8d7935df4830af32de3165550aad602b6762c8173d9bfd28c7ebc7. 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/FRX202299277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c3361e843d59e2501b4c8939e9c24656cf666a0c0132c5158a0e049b871ffe. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/FRX202299287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b2f3fc67f3df30ec2a555fabe4b51004e018a6183d49f25e581b65eaed3e49. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DGA082333460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d9e24e4006fbceac49fc0e65189c9c051d114f5645e7003f1babf75ade6714. 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/USYBL2510439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1104c22b90fe8baa69d48223ef68be5d7152179dd833b70c9297bc957039e9f. 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/USYBL2510432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d364a17239eceb73e88a434eb1e5dcf400a0745e79680882040dacf4fda51b. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USYBL2510441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e058a6a36980042238ed630da829682694576169f91f7362ce5320a169f19b2. 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/USYBL2501494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb32c4d48fafc2bb1d8f4620963a1f2de2082d8b174ca9ec7971b208d7d064e. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USYBL2510579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbcd884856f849ce98a6032526c74f7d8c8cdd9327e206a33318490385d3004. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T23:02:46Z), 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/USYBL2510572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845f79e9f02f02410b7e8fe910d07f024e134121e3427bacb23b60e9896fd23c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GX38U2243270.