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 0x8094702b486f7738a34b3c549d5772b308a61147a7a5da4c4c03ab863dd09b85. 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/19fc45ac-019c-4b9b-a83c-0b7a8368f782.json and https://artists.proofprofile.net/proofs/artist/19fc45ac-019c-4b9b-a83c-0b7a8368f782.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 0x72f3cd14918c6b5b4e35ef9ae39c0a6d8bb2c2dedc2be20d23dbf539bd58d071. 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/SE5752439136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3561cd0dfccd27b582344087703b7287deab0752ad74237c32d4114c0586887f. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/SE5752470436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0f47e9f6f79f44eb11b6a10c04b02826296b29e6ca67f8d264483891c5a26e. 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/SE6HN2415907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734d4bb70264480f30efd3570b1f6688b00d855e3ab66404c8cfc55f73d012c6. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SE5752484342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737de7ecbad2b77ffd239271575e7403264ca0cee77afdc43123acc4dce3989d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/SE6QE2476857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca95a5aecac855f6fe045f8243767ecd9c04dcde03955f4cb3c72cf2bb0b600. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/SE6QE2461713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfbcce830b3e2cd3d6b338c72cf979ae1e487333333b3942196db21af1eed142. 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/SE6SA2414931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28cdd8e0d39abb9b8bd30adc352b6c78cd0910d5815e0e1c31b0d6a8b74b3e24. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/SE6SA2408484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5fd8f9e9a489318af4e9f03772bf37defc1bdd74a45e7ed2143d12fc25af545. Chain 2 (Bitcoin): anchored in block 957550 (2026-07-11T09:54:43Z), 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/SE5BU2507311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd968af7f7a99b94562f367c2de9386d0d8b88d5031a9eb03bf433136224d91. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/SE5BU2510734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83cbbb958981b1ad63c5f041050923f594e56464362041955c6780c07e8e7b41. 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/SE5BU2599582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8a553700b3e5e7213d3d3216f37c5de067cdf12de8cfcca44660ee4558b007. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/GB8KE2509420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2558108b22cafd05d55a43069aae493796e25572ecf8228ac932f0c8d185e290. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTBB2589872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97756339dbcc1a10c575c4676d2984a4901e693de059c16666f8b4268fedfb6a. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZWFX2568384.