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 0xd951f8a2b9a20d89f466e0336a93e1a191517b70e1deed2386b8d4f5f76e81ec. 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/53761563-863c-49f8-9a69-fcf6be8bfd15.json and https://artists.proofprofile.net/proofs/artist/53761563-863c-49f8-9a69-fcf6be8bfd15.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 0x5492c37586104c49adb8074b88425038f8abe2a3f3c010a7bd1288ff65c6472d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZA140300140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44572baf8a9b0fc55be9ae6bf74941856612a46e4e8133dbfcc81691dfba67b0. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/CZA140300141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea75b6ac1f092b0d3641b73d371bfb98ed25aed4c8c0ef478d41ceb3b222c0ea. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CZA140300142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb946ba3fcf5272c750855b28f4f03d9dc056a1c82001689983140b8b8c005fb1. 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/CZA140300144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5079ee3a5cddd094f92faded3c2b016cfb969e4e6e06f3b87f9313cbe7e08a. 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/CZA140300145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c531549944392f0f88cf4b0556345c075355ce8eca9d00b83325c6106a9a58. 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/CZA140300146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5816d7eaeb02ea9191cca1cb7790f5e1c376d463578df78e70873765c3efb7ec. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/CZA140300147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b1b0e20b043b055dc31107eb9d1469ac1c29779483af42d8cc6c500333ac9e. 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/CZA140300149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x580004f33754bed740f3c4f30797a29f264f76a4d1ef5646abd2ac4f67195d5d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CZA140400380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6893dba9cc63051b9ecdab4d6db117b332afaf034da1bc18763f4781ca5d83d6. 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/CZA140400381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8588f9d0de3f91c944a5f25265fb5d9c1fcd3773d133046b77fa77d0905965b5. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/CZA140400382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf83bd51f9c1c8d01cd3e8010cd34af8c21200b4bbb3f7cc020429222b9a4a6. 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/CZA140400384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbad4ba1f9407304b242510f73926b3fa58733bd7616c9de295d530a8860d1fe7. 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/CZA140400385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb500179af962b9de32598c95a55a254dd6041acea6ef81aeafae44bc3e3c626d. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/CZA140400387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a24c0b8e82aee3305baa339e6de83010fe6df94f94a723fe32be3a9e22a923a. 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/CZA210500609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25bcd047561e0230a2549b76ce8e8e9480c1029d8d3fc483164d42b58a2866e9. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/CZA210500612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92510d44a5dc6f938fab025a46ad06801c687f1f1e1115d84eeed0aeec1c1f52. 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/CZA210500614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2f70ded7ce4ae1a75d5942125b8046e106ca4177975e0d829f6e046ffebb86. 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/CZA210500615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66a091a4da12bd6d78174242f8b46910b2c37a029bdb35e0f5794eac6199ac8. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/CZA210500617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x512845fdb6b8d3e8e1b4ffb00bdf7694e35e07ba9ba86c64bb0fdc449ccd726a. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/CZA210600401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d42b3a4f6956614f920626ae75ccf50d8b5738e1f1418741f64fefc0edca74. 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/CZA210600403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ceb038fbcbc9b5130605bc6d7a55013e5333a01c8dfa8d42a39dd8ce83ecfe. 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/CZA210700289.