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 0x5b44256e4fc5f472ac5bc63cdb3efffd2bc8fbde2298429c8e634b96eb839e76. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/773c2a47-d780-40cb-83dd-b4e00c0d2bb6.json and https://artists.proofprofile.net/proofs/artist/773c2a47-d780-40cb-83dd-b4e00c0d2bb6.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 0x61ae656f104d2de9d49c8f29790d13389728c9c5fc1353f95b904a731c5dc617. 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/USDY42440861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c79cbb860574ec90a0a86c34a7647b81daeed0ca04db4907b5a3debb4b3619. 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/USDY42440862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb594a843dbad8b64212abe463803ffc7a9f4ee398dabf39074e720eab2e4688. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USDY42440863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a63d309e0f6084930ad7cb1ab62597c4c84bc1e9c825df567b64a091827665. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/USDY42440865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e3b8dfd3b9b07d2db0aaf67b177e080db1a0881d97a06b7a75c24ac01ca02b7. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/USDY42440866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fecb6614b78cba0876131ba8ff30b1ed98c75cf97e28e5789e6415cac45d2df. 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/USMH92326037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46ed4776d8d6585b7942a2c6f65c47c3da07aae430bb65a3f3c2cd197d94465. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USMH92326039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915d750d8db2f93dc357cbc1a1f080222586e1e232062ae315e726c343403d1e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USMH92326040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78213ff143f04486452a6c91a0a9c00c48fb96f3d4cfd83d81340e71f8c9695c. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USMH92326041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d5efbbfc4194ffba6548370f58468f97672e288f2b2a4d4ce3ae56a06d7517. 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/QMAAK2065622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58b9432cd2ec8c219cb5c5cbe63ef5bff3899156f239e6ba022e084075273f0. 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/USHM91839007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7775e494dca8c589972db95fce3a19e2ad4d5ef6c11e2c54fde742fce2af2793. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USL4Q2438403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007dd243c10ea4a4e20951c0b4e283c5f5bf0bac63468a57364cfc13256b797c. 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/USDY42402095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20bb33db9c54b5524a45f3f922d637ef55ac83b461c6403769d8185cb6a6347d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USDY42402096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419112a5f2b4151e613c7809254d0df44d69824f3b6d892289caf00dbeee60bd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USHM82013735.