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 0x8dbc8a226dc3df546a2afeca048623d3db5f62c915fad5ff688ea948a10ebddc. 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/9c5a25d3-1d40-44ba-a90e-f305d1ea7f8e.json and https://artists.proofprofile.net/proofs/artist/9c5a25d3-1d40-44ba-a90e-f305d1ea7f8e.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 0x9114e6c6aba81a2128a8b68c8f33da735957a6ab3806e66cae2ada91081b269a. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/BXJZQ2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30b9c6c5ba0b4cf7fbad6a20f069e1495d4b128111f30d50e910003a5eeb0c5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BXJZQ2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14dee641cb7fbe7e4e73f693a5df986887a4d7c11d1b0cadc72a1d6e410eabc7. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/BXJZQ2100016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6993a70c6e5fedf0afdb59578ff3f27170f3ba36b23adb36a226073d3b60bcd5. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/BXJZQ2100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb97374476604f194b1d9659d74b5baee80d33ba7f5f3d5ef4f413a7df56d439. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/BXJZQ2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324a66b157f1df8a0c5b5a2c94f6323f1f8ef7346b6ee8a04e5698627e489b48. 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/BXJZQ2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5ab31b12a75411f3985289383e384bf0e7ded05ef5fa7317efaaf71d2b8267. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/BXJZQ2100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc9145980af60ac51a518ceaa28e2f60ad667ffeb8dadf7916bff305fa75c94. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/BXJZQ2100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4aec31ada31d088387fb75a7f4e3b9af90f8b04e18f32556f50dce2480f7147. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/BXJZQ2100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7c1c3fb830bb78251a2a5f27423aa1df39523830940f5f6a3e1aa36ecf7765. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/BXJZQ2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe275297dadcd193a0f766aa79e7c62f41453173bdca72ab10252aa6d7a00474c. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/BXJZQ2100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b87d95985557c63dbaa1073dfd300d1858622c4d89cbdfc94b5d9f931f25e2f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/BXJZQ2100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa634477eb0dc6523cdd3b65e5591bf1de8c95dc140af39b8cbad8fcab52c145a. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/BXJZQ2100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1ee5f4288cb9afe4a44692378976b47022b61045ef5c6481d6f09137192743. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/BXJZQ2100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f843d816fa146faec557b2e20eab99a19f267dc932c188c4423b1a12c8375a1. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/BXJZQ2100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fe7b7723ae55a712c81c14bb77954ae0bb10ec1b2cdecd8d2b1da6dd9eb125. 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/BXJZQ2100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1a7126502a693214d55bbcadf6c3a01759d5bfa92422e7fce33ab630306b58. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/BXJZQ2100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ff1736f6641955bc6feac51fd7caa5d0756981d621a2d1614603551c41293d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/BXJZQ2100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551870534e0c0fae7b8b672bf48cb1753be27b4d2fec9a0b9dfeeb59bd464c86. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZZ762457962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc390de3ddcaaff6a70ba07dc7285339783017db6b904e97cf59979a387ac696f. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZZ772555881.