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 0x10292091a5fdb6c5f392210dafdcfd905e920baca1ec84f13f4dc7952c43e40a. 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/298f4930-39ca-4c7a-bd79-6490dd905011.json and https://artists.proofprofile.net/proofs/artist/298f4930-39ca-4c7a-bd79-6490dd905011.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 0x99b36018e7993c97c7b51a2daf8d61e18e83c082d5b17a883381535c21e9a549. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZK6K2436270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d75047b4ca93e5ea1041939862f493d0a0d05ec3c0fb3ed09a5c2deab1003c3. 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/QZNWV2444710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d866c9019f3600a35c4655edee893c4a3331b6a2bb83e8c174153c07d56201. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTB72457435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ddb0f1136452c0ea65bc8412f54b44eb6cfdafb5d505948677422eea29f44d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZZ7M2477596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a9a1a02cd16dc5c54e2877e963bb6f86fecb5ee3f3b7aa5b5be982624c46af. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZZ7V2423731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343c6109e90a40ae2a01bd62f89716d98f5ee9e7a375a8244e54e4db71f81bc0. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZFYY2579321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ffd56c29b80b09a9cc1119ea768a524c3e0e35f4de21419a8e02afd77a7c53. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/UKXN22524135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0237d323ea18bfed193bd64ff0575175fa65e9a7b3e32ef424fbdd84b4e42a50. 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/QZHN42558007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769f8a0407b345c3a75b273fc28c3c057008ac6b1239025de60f822701663b46. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZK6N2552207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643a4652b69901db0e61e865863930323e929d56b77fad2be61044310a262b75. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZNWR2506698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ff663c38ff1ced81cfb7e10515345aee2d10fda8b5a5cc406ce579bcbf8e51. 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/QZTB72572266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5938484e359f16515b3bae3a5d18291a30bf826900d68e6efa1801bc805fa6e. 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/QZTB72569239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac46ba1be3b51447bb4dcbcc4a742abba972d53761e1da221e36275fc9c2888f. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZTBA2534476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af1d8a825ca987941e4d1c54f9d080612b97bc00522dd7909986234d33106ef. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZWFJ2569284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501b312d9c81fb3a17560d468de8b2b6b45883e85110f205482e5b08d806ac03. 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/QZZ7Q2548921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c07f47b966d1c5a02c9b57e04c9eb26539a32bc3748bebb2af941e419387387. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QT3F92595584.