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 0x788fb19660275851d0ac80a93c725ca2a56d6058ea5331c8f8ca2d12baf045c6. 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/937173ce-0da3-44b5-aaa0-647bd3351c31.json and https://artists.proofprofile.net/proofs/artist/937173ce-0da3-44b5-aaa0-647bd3351c31.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 0x70eff6d327d0309277981ef5ed6bfff054a34ad87ffa5579368233399ea69da2. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/COF019400672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25df2bd1f90524807cb3fafa3f04e1b71b36c24950785c2432e39967a6cf1857. 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/COF015900078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312179e25f7ea32d2099c3ef09a985920c607841551742b3e1507e0d91c66b8d. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/COF019400590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb4d7dc8514c0e81b43d521a9129bee225c0ba9a94a6581484db47924174af1. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/COF019400641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843fb64c6276aa873d0019333035a0e05f9e448a8254ebfd0f26654533078a63. 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/COF019400681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f8f60b52048262f3be8385c21fd18e27884989e14b7ca89b9af546a7288a8d. 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/COF015900070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5dd12bd1c1ec08e61560725fcacade747f67ac4826138b5a28f4b5c05393e65. 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/COF015900077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519084b1cfc02d4c2aa2db64d32c71e59b15e51882c444847c97cd2deea2a419. 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/COF017300150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27adcfffd57e5632c8695741e8c75e75bb0dcabfd10b9563df1a34119e884cce. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/COF019400646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729ea2882b654b4d4e4f9ae93ace36418f2475c32922135da82e1855b26b87b0. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/COF017300141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7360c4002a9cd718e056f1a832db4583cdbf50d93d2f4545e7b0bc2246fb2455. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/COF019400609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98510799078b6ddebfcb19e5cb07d6037ea5c404709aad72df1aac2637d6a610. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/COF019400837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4de98957e2edf59cdc782f1b31cd9bb651cbbe1187346fc170ee8741386eccc. 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/COF019400587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd891bb8a5426a6093d2b55d34f6cf8c2c58a73dff4ff3243d6bacf8f4621b9. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/COF019500126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2230b6c76e488ec9b458832db1bbf398c976000f1181c269aacdb45d712c8625. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/COF019400676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6cf2d1a81c9d492ddcd1841eb08bfc0cec8c5d6291750bf521d80244e88f04. 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/COF019500124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3161d6e87133b9108578129fc233cfd3147ae82386922a20ec5eb00f548e35c8. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/COF019500113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74e4c6021456eaf24de4f78fdb716192c3a141c033c39c0c240fd349a60674e. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/COF019400664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091b32a0752f42e06a3c5a8e3af0aeb6308c94693bb0164c2bf7e2bf32a093da. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/COF019400658.