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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6267b5902dd788a0ae17ea664220e94309708c598beecf7e4bd32d62cc3eac42. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce449f59-e14c-4c3f-b342-2c8ba6075d94.json and https://artists.proofprofile.net/proofs/artist/ce449f59-e14c-4c3f-b342-2c8ba6075d94.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562c6910b0c9991f94a69213184a8c46007bf09f54b10f64801818325f869efa. Chain 2 (Bitcoin): anchored in block 958042 (2026-07-14T18:24:07Z), 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/QZTAS2392175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571e234aead47489d083b39e77b4f40d1b5a465367ad767e9e084e96dca8dc74. 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/QZTAS2392176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3373695625c16d1d4cb4962f66b1514178a57bb24bc937faaf4e3938a722eaaa. 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/QZTAS2392177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9e93130f17a5eb1800671623923072980f898f09b1853ecd80ac65461b313f. 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/QZTAS2392178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0481d9234acfc07820a438110825b7de06f0c7ea386dd937659f8f0427b7ba1c. 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/QZHN32174883.
Portrait of a Woman on a Couch With Cats
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fd02b12f42aae0c34cba359210f7857707c313d8ab726cd99c8b66336d57e1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHN52016655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64192f448434bb1f3d218b4bd3499061b86a0ab6a5f48c4df9d4ba6e3bc0ccf. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZHN52016656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05314aa7aede5baaf9bb0c5ffa115e1aa03bb1ff797502e041d2d297ea56c29f. 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/QZHN52016657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02b9e1db6993b1e59e28166cebe2f4cf061c5d40bfb84255c006cdf8d8005a1. 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/QZHN52016659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b4ab982ae69ec22331cd7bc2d683ff92a7306689796b8c29181d2a3e007105. 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/QZHN52016661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836553707bf69a2c685568a75d09c8ca242cbd00daf949766aae155d2b32f692. 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/QM4DW1670711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd692c1668f3de0f64b271ab58267f8b9bfda54555c133b77416b5e48ed54813a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM4DW1670712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4adb803065c3bc4cf2eacdc22351e96cd634bb774e63737a1a67cebc9984d1d3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM4DW1670713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58194de94d2014f875ca2d94b53005c1bf95fe6de4d355f6ce19a8e589e88d0f. 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/QM4DW1670714.