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 0x145115e0678c3d550dc6fbdef9b64ef7090373aebebb5682922ca2acb993dd58. 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/c3150b64-e79b-4ced-a72d-29f0e2dd2ed3.json and https://artists.proofprofile.net/proofs/artist/c3150b64-e79b-4ced-a72d-29f0e2dd2ed3.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 0x8ec50d41fad63e95c44d6840dcb152b1bfab7998cc97784271adf85d50e5a579. 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/ITZW51800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eedf676850c0026748a6daf74b2e8a0bc1b4847f4c706e0bf270dc9d0cab6a0. 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/ITZW51800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45660589fa23bafe3ca95e9e589a7201f7b146c72aa05de724d8b689e5e8bd6c. 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/ITZW51800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5d10f470955230f5902cc7e343725440cf19a98dedf1f71aeb3717406b2ca8. 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/ITS251800030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf9229a104b5c8c1f324ec6c4edae1f689e22f38097ec0ba80bb0d97541a5dc. 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/ITS251800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0f36065cfc5fafdd6573fd7e757e9d296457c72394daf8ac868ec80c4e5ab2. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GBUR62000483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46215dc98b3c3674eea1bacdf28f60ce6338a4b49d3781e98da029aedac6587a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/UKR6V2342482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7656a254daa1754ff46aa56e3e20f4c297496867136672e0aef508b386a8dd3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DGA0M2377658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d941dd7249a52f104e78d6bffc78fb0a4e108435597f5a9de71291f6eb4ef72. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DGA0M2377659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97be61adfc63ca8d62a2a0f162553884e9c5721c02b683862061bb9b446310b. 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/DEY472475537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b089e703e5062960917e55738d31c93f1215edb534b6bb09b6753059e9d9ef1. 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/USLZJ1734271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6387668bd7454744bf665d5afadf6c609f27ef24aa443131a42716bf21bd072. 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/ITS251900042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4ced17b24fb15c15a0322731b61c3d0b4957f5ec1edebf64a4a795a5598dc6. 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/ITS251900041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692ce9b33b21a8d1f7d32981937c93aef0c66584e9a89dafa9d82e6446b804c7. 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/ITS251900040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2816e9fe34d00da4718c95a34bbb7b27740cee745451dd000fad3228d364e100. 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/US7NS1800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d9c5a4a55c8a397ca7c806262845119779ac263eaba3b2846805aed9390c1d. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/ITZW51700075.