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 0x4942de9d8b8b8708a5b1f1cee25ddd158dc52c720f9e657d7d988063c041f94d. 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/b6219f4a-d459-4140-a8a7-1d60ff8e0462.json and https://artists.proofprofile.net/proofs/artist/b6219f4a-d459-4140-a8a7-1d60ff8e0462.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 0x6c4c46aa6a69de54551011c768a772b5a4f62925ab327a982e9cd64c4e24200b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEG932300110.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc293a0908a21c16c615abaaf546988cc450e4d9d680913e21f786c9aea04c0f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBAAA9900359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc12e528ba32cfc58a92e2935984bf638031e899e5475b00c386179ef7d27c185. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAAA9900361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6981dfb68f02c53f9eafd37355b554adc1d9a37d8ba57808959e45f1bfd269c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAAA9900363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9afbb0a4031b0907d5e78c24690ca9856f43a0819e600b3dea298c22de25f609. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAAA9900372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48940a3f5ae38b61adcd105e1f76a798d798004b9399d051f704946a73e97c83. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAAA9710846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8751382d0325ffb0546ba8484fc4add75b4e840131a25a89f5d728dbd6b3e10d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAAA9710847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b24890c5924cebba9d55bbdc57fa606522cfe7b38e2be425a4c77e82c96d59. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBAAA9710848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0118696a286ffa061e990b588f1390bf618c8a54df00f371bbbbd8de57dbfda. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBAAA9710849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885dbdaca55aff2a2db26187e29dc23f49a9dd00d72ab6e773cfc236297241d6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAAA9710850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02bee2fa042610e2e81c5c83a6c66980793e6e98c051955c7e0d42fb227e79d. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBAAA9710851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe578656c2c9ef0d608d608db48250fb8a1dbbbb120fb5c9dd52cbf9684d1b832. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAAA9710852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2813b436f91c686875b01326e1bb3706d9832dddfb76cb9953d9c083389138d2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBAAA9710856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ee91f93a626893bb9e5d24ce6b9d285bae14d0ff7e5bb52d5357ce5311e90e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US78Q1110060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bdb261b02db88b2ce62cd7feb4480f2d1da2f880a9e6be4013065c55cd5942. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USA2B2102679.