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 0xba3cabb13b02780dc6cc46ecb476a7f5f47d8c32af1c279851ad9af9e61bfa9a. 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/92e556d4-7e3f-4a96-b250-d8d441abb5da.json and https://artists.proofprofile.net/proofs/artist/92e556d4-7e3f-4a96-b250-d8d441abb5da.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 0xba7ce273259854b9a80bcade3d101456560b28ad1de18274df8f109d3a80aa24. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFYZ2599682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba6aeb3b5c34727d8f6d7bc4cb7c4ae169472421a356fe231faa7f1deeb7e0b. 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/QZZ7V2487144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd477b6f1ed0cb5191847d337b955f7b3388fb32dd48ce81382dffd8f66d1325. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZZ7K2413003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f22143b0bd118edb073613e2d3ef72b8c2ea18bb9fa72da2cf6842af3186f34. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZWFK2402649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7be087809f04101f3bf571aefec9ddb07601d5957f8054d3e330967ea9b03c. 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/CA5KR2480798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704d25f442c4f42e81b02ee8f83837714ef1056e3ea907ebef8c03770c144aa2. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZTAW2433484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b883f02302eceb9aa9d6ff0d159f5435f22880781d4ce1fdf321edbeaa916c. 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/CA5KR2471707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbfdd753bc4cc3f9a330cabc71ac56af428379a0ace3b2ea3411e0058eaeea58. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNWU2441234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2ff1e737a6684cc11e0940b7d44d2f69e62743a907197b919cb26aeb7be5f4. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZMEQ2482714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c772457f29395df818ef1395a1542fc9a3d931bf67b245a2bea3efc7a08b4df. 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/QZK6G2410967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f77b2211cbac43e7a9ac9924210589cd10a53780635685382658410b6029d05. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZHN42450220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01ab647f0ed139d81d570a47698a83d6b45f52c2fdd6bd7fad2dc6dc746ce5a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZWFQ2392144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ad04462dae32211efb264009852e17b05642e869b246bbb8b38628ad741602. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZWFJ2304958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44424d18c15411501640dfa68c6fb9e31bdd0227e9408e4a3b349c15148d26ff. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWFF2300824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1208b177727aac6259d9b957298460e6509e075ead3306f395b4e0023088bc5. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZNWV2389713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2423dfa0ce6960e2c841ec6263075f756184ec6d70ad12df71a8dcee68b06d6f. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZHNB2335440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265b17ac4c915fe493f7bb6876aee06aa0c293180bd03b159bbb22ea8c4061b7. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZFZ72361756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5795824ac74bd7466163f56d3c18d95cdc0e86192d30c464c410a093bd7dd8c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTB92274335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a75ce4d4ac6e4c6a77e40dc3108f39ffeab496a60f48e974801759fc279ea4f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USANG2202309.