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 0xcd0b06a8198d257618a9f0fa150389d3fd2a6170e86665901a32eaf76cfdcd08. 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/85f3e282-3e74-4c6b-af72-0eaf009c89db.json and https://artists.proofprofile.net/proofs/artist/85f3e282-3e74-4c6b-af72-0eaf009c89db.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 0x02516d1d0e75fdea8e6e4c5a390b52ed9b17b367160f1d2715a65450dd358b61. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWT2056568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c4bfeb98297d005739d2ea28917efd26886c36d49d7530a93fc72c617a674f. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZFZ42354522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a944e10c7645e55df1f7e1c95e4cfa0637110edb6e220abe242ab528686e91. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZMER2362019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1995ad436e7dbcd831eb71c751512a7566719d8672eb9edde5e46b1c2596391c. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZMEQ2311976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cff9eae30794839e7e1d3f1230674c851b5deed10998f894c360297c59c79db. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZMEQ2311977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd5288c90bf2582aac87fd9ca003603d502f8b505078caa6e1986bd8b7e6015. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZMEQ2311981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1894d9f5ea68eb0d0627b4bb759371bb7d7f428abbd819116b10b782417d19f7. 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/QZMEQ2311982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3492c023aae6af3e859998152667b7ea31730305abff07d0d6d1fc3ccce1c336. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZMEQ2311983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5392cf7d32d8c7cef98381ccc4d8662b7cb902c171cbf509f6c2d89afc2000c. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZTAS2351537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff063fbd8f6947df32d7d642f101e9f3b59b64e64b72efe03d604bc2168d6186. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZTB92385472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96bb485ab5bb87417042af2130e21e6e4efefee4b43fe9cfc8319e04ac7f978. 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/QZDA52409669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaced9ee2402d689b1707d3b6ec65b5c8794546af2fb7ec0e8c5bfbee69ef6bc. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QZDA82402778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cfb5a850c0d56bceb928a396c613b93466cf4e43afac9d76c7124117a7aa8a6. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZNWQ2401007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7521ec96d1017a935b4996324b95acdc863c77c95f366854bba14492829bb6fc. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZFZ22507858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fbada72c5178855128fc5207c81b69f1caee099ba3065f8bf4ef635521a74d. 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/QZFZ72552497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7afa1d9a50506eed511f776c8c330c3a257e98713f2e29edce975bf494e0cfb. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZES82571850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861646b8bd96f865d86dcf618ee322e5a285cf00a9eb3a5cc60167f581cf085b. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZMEQ2502004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc7e65bc12691d11650ec9ace55c4c6e84498a708786167e3ff5d14d6204962. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZTB32566184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e06465d5e3e002464ba865081207e84cf83c2c134d3715d094b320d147da71. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZTB32566188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f25c7ed5bcfb9425f62ee0234542092f20717ea3610ad49b86f6d00f568a57. 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/QZTB32566192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef04c4b27ff2369186327d1b7456f97654bd364d0268e1dae62581bc827df527. 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/QZFZ72387399.