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 0xefa4101910a247d1f938cefd3137cf6b9cb3dc46cf5699ce5954517a51f2df79. 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/77e4fd1e-a6cf-4f04-88ff-56d9d3ac6c43.json and https://artists.proofprofile.net/proofs/artist/77e4fd1e-a6cf-4f04-88ff-56d9d3ac6c43.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 0x7543510cc2d2c835a76261e54c6a81d409c551cc51a73ae6d198d588dbde6a48. 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/USLZJ1984271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x212362874ee7c6c650996ccf7d81f9d16f15778582cbe3e9a99b197ea27645cf. 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/GB2LD2210316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b4e994774ab4679aa049f427465e7efc0a7a4651544505fd03c41a829643b1. 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/USLZJ2284997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceeb5334f7c4935eec25b7238351e6ed03c1a070c54417b2fbdb2de41203a7df. 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/QM42K2181707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x996a277afebb29bded02f60f66474f85453f8c0f55823a52a644c64c8d6320f5. 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/QZMEQ2003355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a389f760c4bcf456c4c421ed766ef56cc4fdadf0ad295f9181391720548df80. 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/QZ5FN2096425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19ca30a8f8d470915d16442262bb56a92b5ffd522996bbdae087f2e9e1b8c3f. 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/GBWUL2011121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4dfd370aa07bae0a08d34cd79043f778efe8ebd7ca99f20757a3d659af76242. 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/USLZJ1984674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ebebdb4e06549fd5344eee3e2c07859f88ec79b1ea32e609a630cba669132b. 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/QZHNA2010876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835c9bbeae59e7b50cedc85294d4dc0035cbf6040b28e4c30dd0f3f33cfc02d3. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/DK9H52201001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88d7a460ffbd10b62f1952174f33d3ed09c9b6a4e54109bf3a09d31d62cf484. 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/QZ5FN1978121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6cbb4870fde0cc119217af1226feeaa22051aadc7d4b0b512a4366f90e6795. 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/QZ5FN1891948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6c9baec2615894e43e8f68ce67e454b005396731e73be1ffd092aa193a0ed1. 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/USA2P1814360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c22fb6fb3182e4653796bff4c8c430c8540a0b7ce0ae140a5b2f6365729a63b. 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/QZ5FN1775463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39b28f545b2add230133483650feed9e4de0cd2354463a85901f62328c223ab. 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/GBKQU1783958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26598bbccbd1d0eba58b75def2abe94cbfd0e0fb7bea7b938a2f0cf95e9534c6. 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/QZ8GX1700279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf763875830bf2ae0784ebbc95ad8911aae8c2bc28a1300c676925fbc5c11b636. 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/GB2LD2510070.