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 0xe4073d59ac0511f7af1d6a4ada313e99230c06b7c21370689308f20e0c5d5364. Chain 2 (Bitcoin): anchored in block 953599 (2026-06-14T06:43:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ebd603e-c6d3-4c6b-9331-b1a160e1aa7e.json and https://artists.proofprofile.net/proofs/artist/0ebd603e-c6d3-4c6b-9331-b1a160e1aa7e.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 0xd0e79502d0862c4e0f84981f31f296f4670db3e2666f94a0f38554aff8e1a8b8. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZFYZ2299265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e79502d0862c4e0f84981f31f296f4670db3e2666f94a0f38554aff8e1a8b8. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZFYZ2299265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a4cee0ce27372172c5f9416dd7452be9df5db9f1637412a39f34ce19976bc6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN42294798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e69a475c048685a6c62c64ef611412d1f76748d06c1f1ee6a3419ca449b9fc. 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/QZTB62393393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9dda68488086d695d36e49c6be33552e1192df6babd2b37e8ead1d362f8495. 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/QZTB22348214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61fc74b8a6a98dee0cfaae8dae29c36d36f64b4f7a1d772c90fdd0e86ec14c5. 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/QZTBA2394769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e69a475c048685a6c62c64ef611412d1f76748d06c1f1ee6a3419ca449b9fc. 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/QZTB62393393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33cc107ce1ece5d3450efe7e49f8ab9307fd12d5aa65a12740ab26aecde898b. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/QZTBA2394770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae12fd0417f588839d4032d8a67a390ffc80998a32206bd17bc13c34a0f0ab6. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZTBA2394771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577e0469ef46034e6de6923e75593b1efe81eafb9cf57877155cfa21da71c563. 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/QZTBA2394772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45ca9af47ae85e9fa2333e8b9f34c455939090bfb83bdf0d4ebb427917ca513. 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/QZTBA2394773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1508465d76cd3434d3225f2febe5b3c7cb4e53406587a6fdd1f9ccb88488ea9d. 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/QZTBA2394774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3aae2fe0efbddbd0ddda47b9f1859caae9bb735acb7b324497c9c73496ce05. 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/QZTBA2394775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf608dfd57857c6499444cbe182f1e4629b9faae5c26d590fbb7feca66e73da6. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZWFQ2489012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525a4c1721a70e18371a9b66baf715cbfdbac4b3092e46461e2efd90178bee6c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ62562520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e083a924a07bb37a654051062fdc40bbea79fd2e4bfe2811934976fe4d8b963. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZDA52560179.