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 0x3ae394f2ddc2da2882f780a392abf23d3af40c719ca6301d820c843652b603aa. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/99fc30ee-875c-407f-b202-de5603b3e70a.json and https://artists.proofprofile.net/proofs/artist/99fc30ee-875c-407f-b202-de5603b3e70a.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 0x58239baa6cf54b1f56bc3d9b1a4db424d81f312be0308dd413811d69553bfc58. 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/QZZ7V2424767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e195113c4c941e2843eb818cc1c0403048f7b6c025639b6f331a8925edd525. 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/QZTAU2490298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e86369124b5740c77e6f33662f6969e275356c8ef5c76cb6f41911488d0350d. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZK6J2462370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248e23a12c896d3dd5424734398c70ec6b36bb22a19eb0507e8498188f0636f9. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZHNC2350727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce95b15a3fa12528d6d7ea1fdd16f37e3c5a30e9a223a23cc577ec6ca53aad4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNWY2223344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b1ef5bacd11123c8264f2ef3cee0398c044dafd8faa0328a51d56b6737691d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6P2238246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbdaae181702e3ebe2f8c9b0f59d3254c4f4b457c843bb9e932fd2b70be9092. 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/QZNWT2181798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815bdabc0f28759bf1ed3db69b38b8e101704e71461ae91b20e155cf41a9c2a7. 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/QZNWW2003682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0faa64a7bf67b249e2fd8931148e86e8a22f1b792c4649d17cf6ed92ab06f889. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNWW2003683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d0ed1f7ca13a8b573c1cd945477a7af519a2fa28dbfff704a19c899cc48438. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZNWW2003685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b015a4c395ade0a28dd9bcd8c08b8345d53878d3310599dfb1c84eb6d668d6. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZHNC2033018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf960e67d4b4b259ac507b2a5c71bd8ce81662fffe493b29e4a7c1cdc9f0acff3. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZWFG2359489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d26d104edf93f5a4359be3a1a0fa0dc893bc7c89ff0e50d3a1e5fa0e36d61d3. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZWFG2359490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d66cf5d0aa9c3871465ce6b3366217e4dd796060a0bd90c24e3d779bdaf3f6c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWFG2359491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa15063c3f4c72f0f30b12c1d300ed2646f2e104a954a553ce1a38c1bfa8e1ce. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZWFG2359492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238e06c87c2869a670e0bd66a0b399a1cda0f88d1b56dc6a3455fbf919187010. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ESA011867880.