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 0x806225b1c85886996687966a60dac1d86d0ece122b768697a5cc6eee4a7d99bd. 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/4591d6b5-7b69-4bb3-9fa4-e98dddb2ef82.json and https://artists.proofprofile.net/proofs/artist/4591d6b5-7b69-4bb3-9fa4-e98dddb2ef82.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 0xe5400e1e6138986a235f2db2968186fe1dc1282b8169b4d0eab92bf15a0ecf10. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCJPM2046626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42751876a58c55afdee3c8722d3bdbfa1fb9a71c2408059408fc6a6436e85d0. 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/TCJPM2047434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7db37d8ad9312a372bcf0a52709bf533dd6e460a0e454a5925e638fe21110c6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCJPM2068237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e1b1e00df56a78431a2e165130eebb43fb7fbd7339cdd399a805f2f93ebcab. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/TCJPN2172205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafe0967efe7d99b7324ffb9e2644d4b8979aa49e7d9c32c721c448c1331627d. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCJPP2116541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d150c385ea7049df3f6969035cd7e375bdfdd66cbfaf6fc0f85df466a6b95d0. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/TCJPP2116557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9875a5638fada70c447e0f0716c569970553592e12e5887363e1d78603881312. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/TCJPP2116569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3077f8ea9ffab676d2217cb80cbd727f09e09130bf99b7e5fda355280c641b26. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCJPP2116570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75e6723aefb9ad5a466dea09468eaa525d58b3faa4dc8715b2dd1ba9f85aa73. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/TCJPS2254122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dda1bab95e74ddcf1dc8d6dfa58769c65ae68a77ae31c53fb172f22e9590088. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/JPW792008875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5576b93969b41fdbb571cfb0912d0567083dc1deec2b57b8a5be04de82ab16. Chain 2 (Bitcoin): anchored in block 957573 (2026-07-11T13:43:13Z), 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/JPW792408759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acacc82a595e0d01d9bae54843b9ff11e4bc34abe0de01c15620784795fbcde. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/JPW792408760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7440a29ebd4943dfeab853e8d34db88f4d66a9a3d6032fdaeee1be7ecbd09bbd. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/JPW792409156.