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 0x3ccbbdc966785580a0806474b32399730872db86ae62c23599a882e84aa7603e. 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/761cc99f-3ee6-49fb-912d-193316a9917e.json and https://artists.proofprofile.net/proofs/artist/761cc99f-3ee6-49fb-912d-193316a9917e.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 0x0dd38acab8f75eb6d06f20b7cc10bc006dca6fcc3b0613f5c0f9fb0de73936e3. 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/QMFME2117482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9410b135861c8db8a2b0f8fec8108137f58502b70b8753546d46ace3b4f7a2b0. 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/QMFMF2020379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434552607b3e18141c6081a10e79f49865783a9d71fd057d8907b929126f48ae. 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/QMBZ92030629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3783edab0c6c13fa4306b93fb3795dfbbd5799c4a40942b1bed3428ca8cd2038. 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/QZ7HP1800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec43a142df3eb9fbb357258c6c203bfd128a52b192e516e76ed6dbae96d73c9. 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/QZ7HP1800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755d37459f208209ca2c1b567d1fe29063b8c4abecc8e94024ffc0fe2bd2a9ba. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZ7HP1800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3783edab0c6c13fa4306b93fb3795dfbbd5799c4a40942b1bed3428ca8cd2038. 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/QZ7HP1800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9644610ea6f6d6a32038ddbe399f621b30b2daf68370f4c2b064fedb3c4cb1af. 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/QZDQH2301118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26aaf1a2f168409a5bddbe302be03457b4ec7398ea0c4a00eaa98280254e3491. 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/QZDQH2301120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8ef6857b6ac9ee07706c679f5f45117bd4203b9dc3a47c0393b03bc8f63e60. 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/QZDQH2302122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb538b431c0b4d5b844be00eaeea597b4b5d46444ec3d9ffec06124e43800ffeb. 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/QZDQH2302041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5d97399209e4034c1b3df60430be9ba15faa8eb5bb031a8442b7225349cfeaa. 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/QZDQH2302124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd49a3c0973398b57684e19288ab493a0327f0b6771feebdb6b1488b339e4e7c. 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/QZDQH2302123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a0c29849e3d5473d7f186d104043b2c9638023568ce3b2a1791ad74345ad33. 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/QZDQH2302125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e3d346ae808dc1fb9a4feb014b87c67230006de02b427fb78116c3c2943a4c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZDQH2301518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72769c7a6b48f2066710566f810eaacc0d4f4f73b30bfb1b44a3176e51f6ae7. 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/QZDQH2302126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef39318f19f567ecb087f539cb8a992f2a6a446f692293d8c0676ebdf4a9016f. 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/QZDQH2302127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4bf2cfb967574a9fe01abf163b588e1a70ae661e9188ab904e2e53ee112312. 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/QZDQH2302094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef39318f19f567ecb087f539cb8a992f2a6a446f692293d8c0676ebdf4a9016f. 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/QZDQH2302127.