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 0x16b61f6b5466d788ae27ba9321da157fccefee82cc3892b19ec1feaea35e13dd. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dd9131f3-62ef-43e5-8964-cea986251c41.json and https://artists.proofprofile.net/proofs/artist/dd9131f3-62ef-43e5-8964-cea986251c41.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 0x6d97b1f6f4cfb58c6adc418ddfbb1b3701a71f8404aacc73d8aad49af22e6de7. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/TCAHZ2484431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5453e24e17ceb53c66a3d91f731797bbd67320c3351477cf0cb78e7c5d4572b3. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHZ2484440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaea2acb28bc4c680507eed4d58a72c873456e7c418eddbd18a09d65a82adfcf. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHZ2484457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe604e166a63995c2ab53cc67b907582bea513409560d850526f06d721212c7c6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAHZ2484465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe520be242a6b6fe1573c3c94e67d3c99f4bd39c5ffc707cfd550bd3a0e87c7c7. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/TCAHZ2484466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f9b78179ced1c38f83323e51a2d147f529e36289f55d80e7f843d5599bfc92. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCAHZ2484467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6068a8bfd6a82892282bfdbf8ed01110529150367fc933f034f4ade007551f0f. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAHZ2484469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f362c977c64a8a9e65f837274e6143562ff5aaf8bfeddcd1b1bad43dff7908. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAHZ2484473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4dd614f031648b67101ca31ce778903daf337f3f37cf854d2331d9dcf7c72d1. 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/TCAHZ2484479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9415017fe00a06246825a5575a2acf769d89ee4603019b6ab3e364a029be42. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAHZ2484481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd61b6f818596aa0f9307aa7ef2ff49f8dad83923433ff7373ce1597b47d9c47f. 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/TCAHZ2484484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2d64bd9823319f40b7881b8ea1df3e87b25424928bdc7ec625890f676cf230. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAHZ2484492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8201f5cc56f7887dd5df4d11a86bcc02a3ace15cfaa62d1334a5f19e379cc02c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAHZ2484499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f0c7d8169120180e2db5c0aed4d51630489e211b1fae2dcc03405f558c0764. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/TCAHZ2484504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d72e9059a09439223eeb0171b55ff48b44415b39c7a9d75786b58c0dbcf1a4f. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TCAHZ2484507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2926020599c452fbacc471fad115640407d5db2d5aa3a14e07d49fb72a17e0. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAHZ2484512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce82d8e7bf5470be17157a3cfdf37efb510ef8ea1ce6c78de8ef5783816d6c42. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/TCAHZ2484518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf789901c69039d82e668151a5ce62a3f7c793d8ae29f346badaf71aaefcd3eb. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/TCAHZ2484520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936943a6593489b49cd54dd3e7b5df354dcbc5c5ee27836edbcda99681d7f959. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAHZ2484523.