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 0xefcf083675ab647589aeed5110c79f7b9eb06fa5232f0d56a006b9739409f474. 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/39027f0a-c66d-484f-9ed4-d3a9f5227d26.json and https://artists.proofprofile.net/proofs/artist/39027f0a-c66d-484f-9ed4-d3a9f5227d26.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 0x27608cec8d8679cb2a50b1e934db9822df4ac50948621b2be122e00ad0c57210. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZTB92259613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770da984c7f8c0ac4d88ea9a9a272840cd78b3aee090ca550aa89f302aeabf72. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:46:40Z), 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/QZTB92259615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8469b476501358a05311ae188ab263dd5d9b584ebc0bdb67d2ece39d9b3d8ac4. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZTB92259616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c28ffc3e20ac53cd5f2a9b3e17a0d54a13d5a75d3f637d2d38cc38331ef1cdc. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZTPX2396149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a069e9eb564c5ed6db377b0437fa7dc95e6bd516e669ef96814ef50e468e7f1. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZW9L2309322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027f06a4eab6c7e3e3456215082144a88bf931b1c53de73591a77073a907f011. 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/QZW9L2309326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c11ddcc17fff59dce29fa286b5790b22ce8ddfac4a39022d9aba9213fbaedc. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/US7VG2463693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a211b7b92b9d8f845d92a0979dd946ba80bbb104a1def8a3f2312f15bd7b94. 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/QZGLM2461730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a382203e36f809eff96a2932b78dd45d8d0949b98b18ae75bcbbdc5b661ea7a. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/QZGLM2496852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f95a95e43b24259be8e0f1dad8a2fba6f09bb83373954b854b084f6ec4b7b0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZMZ92449626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32c04e2ba1aa453e3c101f2cca5551af243c09b598a08b0d6248efbf584bb19. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/US7VG2523792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58aa363dcab93673db64d2fa500986ae930053d906065d74ff2fc8876acdaa06. 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/QZGLM2578066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79145bc990c3d8c660fc1b432e3918a4f3e0fa3aec264b5c694a932159de107. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZGLS2534067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f6c96a80691928d7a58b249f18d4abcaff03695e16d65c48ece52f37c6f705. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZGLS2534073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c84d45c9c6dffb13fc1ebe17d35d6ec8d4d6473414beecaa893e2f8c459160e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:26:58Z), 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/QZMZ92560402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x205145adceee87b824a5d4596262949080cda57a57d1ce2d9dddc77a759e457b. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:18:24Z), 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/QZMZ92560404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae62786e3ecbf2184690d8b979fdfa218051043fa554d8cf76dabcefa94a800. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T02:07:40Z), 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/QZMZ92560405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147077bf8327f61a25a590adf5246274128a5d5699ef0d840c9fb1487cfc9b51. 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/QZNJW2562090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfebb1a9251cbd2c02247d64eb3816f9b0f7eb05a3b8e8c7de2eb2612ea2a1b1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNJW2562093.