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 0x0b35814ff2a592e9603c5c946f0d478ef9a40c451b6247dd6ea036acf89057ba. 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/e860acba-459a-456c-a59a-4a71b86e4f81.json and https://artists.proofprofile.net/proofs/artist/e860acba-459a-456c-a59a-4a71b86e4f81.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 0x2a67279dffa6061841093eb86b4f7eab14e294371357219256ae1a24637ac23f. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/GBMA22184055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3666ff4c1d21babf364cb53e7bb53823bb59ad1333f07e9502f993e80c45f0. 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/USHM82135779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569feb3e7a48f0fb686eb853a7266b826956b66d6d89e8b3e0d246f642c669d3. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USHM82135780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099512531872c7493d56541bc5780a23a8af2ee29248717e0ac3c7c49bca98b3. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/USHM82135782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9fae4355bee1512d05f50f41d7877120e8725eac6029395b2b7f353ae2b239. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USHM82135784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177ec74a0ee986ac99707b63cd00abe3d6e360bdff212793ab28c2b60a479e2a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM82135785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9653dc76b5d7fdd39cbd64f774c7c4101df409ff8641cff9d18f29a448a0c8e3. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZZEB2322697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0743bb6901aa475abc03ab959d61aaf7ad159605522675817d6e29672f94db. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZW9K2443449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6e1655ddf894461a3cc6a4a06bcd30fceb1a5dd58d609a46b1b15ee991ed03. 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/QZW9M2420860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52943b983afea450c88dbababfa1f7df6617d33bdd070b670b86e27fda44f196. 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/QZNJX2513298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5ac646910e5b4f82a84b3c606a938df49895b97046c4b2b1f4b192733b5453. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZNJY2558337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09911a29f2078c6c5080a471abeabbe6934764e28d87d0481ddd9cf7fe5e4b18. 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/BKNNO2200026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa314dd8ff5a74d47156ec9a94f492f1c80e4f6a7808e5093d3d9064f856dd602. 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/BXIV82486821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4232488b9875fc267cfcb5eaecb59e324d626a26f3973d2a9a9692f7cd4e41. 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/DGA062404378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b88a1277bd7b08b4a8a7f7381e6a2e35bde949da30c1857c0afb1f844234f46. 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/BKHPJ2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4232488b9875fc267cfcb5eaecb59e324d626a26f3973d2a9a9692f7cd4e41. 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/DGA062404378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda18c40f4a7c634075209ade86ba7b06b4eee94a172e926df7f7ff88618afad2. 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/SE66N2200307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6dc79a3b24d3d9cebc8a5865f2ea87421f7162f4af0f0656b7e170a28e6dd57. 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/BC2GV2400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83343a033ec2ea3e34eaa0c98d2586a426904c6a3a3f8c82ccf94cdba64ece2d. 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/BC2GV2400112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27ec360344d63c641582ad6e33015ff937e6360618f52d4e64e0c2a62dd8559. 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/BC2GV2400116.