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 0x17e9a2e228c1cdec64efc14657706d673b37c0b5b4faab4e20b02104862106e5. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7a76fef-d8d7-4284-a09d-5394f0d17e0e.json and https://artists.proofprofile.net/proofs/artist/d7a76fef-d8d7-4284-a09d-5394f0d17e0e.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 0x2783b86f61ca03aad88e2111f75c03d756af33af2bcd20d0c9f16a32d54569fd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWAE32102402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbee851c520013db2b13a7d4244cb20b1217f5db52a65dc55eb3e592dc02acac. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TWAE32102403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe234e4d433e50aca429f6ac82a2a0e6d935308e40df1c84fa40998f624d531. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/TWAE32102404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7f89bc96da15bd32953309e8fb53e33dc0ff779c3db0b669c223c06567bd54. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/TWAE32102405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234cf42ab9722c4d0b80b4127ceb4ac88d84caef0db6c4d2ce63511bdacbf1ac. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TWAE32102406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0f90554c04fa662d6f574a15979e22cbbdb0878ece6f150cfe3d99a9e9addf. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TWAE32102407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406877bae97ef1ccc1cd6fdddf759c30b419143d1f998c5acf5bbcdb5084f38f. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/TWAE32102408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eda4af5a1c4446b3c912f002471128088af220f66b5d14fad4424458495dbf4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWAE32102409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf32ba64c6f0e4efbe3369b45f3a03203db3a8cf550689a4bff429d9290a295. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWAE32102410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54add94df4bcb006e89573e225b0815ee681f5dccccf3385967652ffa1d05bab. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TWAE32102411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc738b8562c62d8ff49ec13d1a45bf249ba1af944c00b3ef8f0a3efa61ee2a9. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWAE32102412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7d14cd00af29ed6553fc877ee61e6bf113e98e773d38795440bafa10e7f11d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TWEN31800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf42f0cf8d67f3606ce92c80ac1c6ae96ce4b45ca5c58ebd83ac8b57bdaaa2633. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/TWEN31800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9023e22f5f36147df38c4e2c5b34a509485cc89a88b7c8b9b8255b4a7f6b04. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TWEN31800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b13868130b4f909d222092c656a6b0e22bba93de26597df43e98a07a891785. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWEN31800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2f1494ce1ac4a9d592c2ea91df63023903df8e83694bf5e41c6811e017be01. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWEN31800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e6e06981767435d224c51a264b049ce1f1c3aad980d29649755046830577e0c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TWEN31800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05aa648563de4cfc7da25064fcf5549e0c9fcdfdabb20769633bf1f893c66cac. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWAE31902339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d455d65c2615c1c69b80eec44d9f6878a389b9d0087e63a8504f81d5c928ac8. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/TWAE31902340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1904ba77449f3e1568f6b6c9ec19d4b31d57369b6451d586cb627cb1aefc678. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWAE31902341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91edb468693106225edaad9405fd888d559bba5d00a0ed9337bc7d68d07d741f. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/TWAE31902342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa1754fdce2290db267656293b91285f202208453bed8374c82fe106f2d54a4. 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/TWAE31902343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd787b001898566246334449f866ccaedba356e7051712088a5033793af4330. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/TWAE31902345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca4ab124bef2dea6c72689bebd0c4e25f72a5ea4be0312f273ed4cccd513fcd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWAE31902346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5a80180b8dc7b7401caf863dbf1c219c69aac34d849372921b57e1be34f28d. 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/TWAE31902347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed0ff031f04d4dc9b27742ca62d2e48e3c6dc7137e65c5c6ec408369ae0e48a. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/TWAE31902350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6aa9c52a537e80d25167da34e4454539cfdda2172b6e55137adc7860dcf65a92. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TWAE31902351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e269c253c6639c5cb830cf0f69da790e236e3f3d37d30308ee313a9e11ebd2d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TWAE31902354.