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 0xda9ce577edf0e1fc04eafdfe3e18326390991e6596b4b5e09cc5a9eac38ef774. 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/4084f562-d1c1-43e3-b181-4021ac47a469.json and https://artists.proofprofile.net/proofs/artist/4084f562-d1c1-43e3-b181-4021ac47a469.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 0xc04adffa56edebfd9acb1e7ddbb6f162885b9ec0bbc5effe5c2308f383492378. 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/CALVP2431432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36378b68b317f87429cd3775da2f5f79900fc4ad1dfc3feaef34dc423e073658. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/CAGOO2476093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000c6b3ea25539a65bf8526fe1081d21b895c98dce06d2f78dd749314c44f8aa. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/CAGOO2476103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831893e5fb211618b1eb775149cce560396ed2459b4010ffdf07c25aeef9fa54. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/CAGOO2476104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cac0a5c3521717bddc07839d7e1565143e1e8ebeb9d8031baa9556f6b1aa239. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/CAGOO2476105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8958b42fe2af93e85f05d4e31a7f4d69716973637561c14e2ea411745f2443ec. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CAGOO2476107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf009b92ae00ed032977d48d3d988e0bfcca372db75c8734c7462b3155d4a30e4. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/CALVP2440184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21bb7d378c43dcb62474551207b920b4391556de46e378e3b0976f9929b6cc9b. 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/CALVP2455716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3503e29186983449fe9c48365fbd08a97f9a871bad122e93fa8d55951ca7c67b. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CALVP2495219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe616d3da0b23b10b75a1539efd2e854305394dc0ce6f2f9bcb1f35b9477140ba. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CBEYJ2412723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7af139aff683f8a3ba97a012d9ebf991e7f7ed07f880587b75f7dc17b81fcb3. 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/CBEYJ2412801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8df0fd355e11aabf92a323c176d0ab262de0a0f8c61682ea41fc48bdfe952a. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CBEYJ2455617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f68e17194cb54e8dec5c47502a0af8f986b137a5b23755e119a50fd73d154a. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/CBEYJ2488236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a68bb06a77c16970fc4805c6ff10289e37d9780e96b0d0fc90bc88a381c357. 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/CBF8B2415155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ca58b2742c24cd31394341fa3c752c20956fe83b23cb4c2340b7398ad39b9e. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/CAHQJ2554645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08af5187277150e966c2064e565634c305a4ebcf7bc656e276649133f0a22db. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/CAHQJ2571139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0260814366fc9b778b9e0d2c4d2b15f8c5dab44964c0308120803da7f38d54c7. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/CAENV2548380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa220dffb0e403e8551a16b07aee17a77f3507f967030babb12ca4b6ffbaa5fa5. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CAGOO2557803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828570a26fad4b8d307186b9ca3d12dd09802cb122ee8ed6666c3c43c3c1cb21. 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/CALVP2534710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3927f6c62cc596f478b634105318a582df3c65a8a3de899e93e73f58ac167c37. 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/CALVP2580230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2deafc92c59573e4c856b4e932f7a3d908e8fb4c49d146e16939f2513422ea. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/CALVP2590309.