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 0xf5a0dfd8401e3367f89176eea828212bee07a098e6349afeab5e5e1254151885. 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/df55d112-94bf-4093-b4c3-0682fff1aac0.json and https://artists.proofprofile.net/proofs/artist/df55d112-94bf-4093-b4c3-0682fff1aac0.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 0xff1c8649a20e3707154a748efbb80c09fd80a0a7da3fd048347032c42ae1d9a5. 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/FRX872001138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d3163973d0efdae1fd25ddc26680f684219d935d45ce2ef028c6a093c02791. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/IL5842134960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb3e90ee47d58c1a975b7a576d81690f81d2294300a24c7c0891def6133e50a. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/IL5842236767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e96623b6b4bb1ece2c305b60607bf134de171847a97221f48d864002a1b7d7. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/FR2X42068010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5b2ab06bd81443325526fa2661e2b68ef72a2592a2844eb2a44e03a6a8e825. 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/IL5842339811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83bba0752ccefd4569064541cd788a3dcc29ecf57c05046f51fae0a840595b68. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/IL5842340242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c5d258ebbf5ab14c310d2f5f04aa829ffc3c64f3ea4ca77993773c7e44970fe. 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/IL5842341584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4971df9e9114e09fb4dc16cd2530ee12843f3058a948055e5b89de060f6645be. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IL5842341585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053315194b3c282633709175895030a049c7ada0040d0783d61c6a5c3fb5060c. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/IL5842341587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb3e90ee47d58c1a975b7a576d81690f81d2294300a24c7c0891def6133e50a. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/IL5842236767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd5ce2738dad77b2a4fcce6fdc92f2d8a40a375775117d4c84085c89822f04a. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/IL5842341588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3230b5d8518d06968ab5c46f2eafd7528278774440ee71c75dd0299f72bcf1. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/IL5842447189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d281668be7e961ce2ed290c43e46df3a71ad6e9d271dce35eeee2b1f1c75f2. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/IL5842552356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdbeea96e9702ea243194d43d7c01b4bcbb720a7e610f5d3c7051aafe8d4785. 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/IL5842552360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a741fb8d43eef8d01b551998e915e199cc08f7a537241df0d3c511660ce47e2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTB22215610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad5996d82192d680ccac0f749f3d4f37c0dd18ce689dd75328af988a5098564. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/IL7532421553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb99371e1f129c55b12ebffca0f3a15d192eac8e238c42ba5829cd941ccd8a8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNWR2222216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59aa3bbd02dfb27b35e1c81f97aaf6613ab6af9724a94b02783452707aff6ae2. 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/FR26V2006296.