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 0x3cd431dc3066dbe3b3e79314c878471d6aa4cd09a3d63ecb4d673dd797ee6b9d. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c08573f1-59a0-42f2-8a0d-6012c9aea3a9.json and https://artists.proofprofile.net/proofs/artist/c08573f1-59a0-42f2-8a0d-6012c9aea3a9.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 0xf906be04da4dd4759a6feca759ac4cd36bb462868a963135120019439e9f27d4. 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/QZ7YY2190062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4085c0dadb25ab356c43b241256c0fca498465cd13cb01c09c5382e1410a8d5. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZ7YY2190064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29372bd4213723b940d25330a96795520f4fd576b9f49d8e27ff885bcacb37e. 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/QZ7YY2190068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23310fee44a69e654ebb9dfd776ccc2e9d20eec4d64646dc3419dc510966b55c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/MX2971901512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea820e441945e5d28a267b43cbc4293c529e069ab323b4edb014a67ba9d86bb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/MX2971701371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc870e54d924ee74fe5ac92e11fc940f8a338c0602380d0955abf0ad0952d0e3. 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/MX2971701369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ad70b4d655ef3c652d54df941378debb31a82c24ea33e25c71a771e8fd8009. 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/MX2971601184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff6d5b818e44031dcb85c8b90f6545129457304f2f798d53f6766203cb4c248. 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/MX2971601252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc768672fd29bcc75cda87e91bcdd2754099da41b435e8b832d2779d0bede7dc5. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/MX2971601194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ff30b61bb762b7411005e0d9ca09888403302b9c12969a202d55b82d025f42. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/MX2971901515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1da59ec1ff8058bc6379fecd2b66be3b8b64a55b7b8b5536725e82fdd82c40. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/MX2971300493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84458420bac33b7ed2382df16b6c0aabb70e6e9ca52c38a1c9d322512aba177f. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/MX2971100209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61555d9e0097a9dff43fb7f275a0a9235ae80ad71eda9e3ec64fbb05d148bc69. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USASN1101703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981ce4e6c60c75f6bb125b67414db9ddac7432dd189a635ef0f9e19adf029581. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/MX2972001974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1bfecfd3031c44cf9c9f709e4120d9d140a5bbad3ebf1d058bd07de7aebd2ca. 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/MX2971400995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52806aa01d3798f0338b9f299e7db2fe2d5df55d7c7bc966e01c3c117db21054. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/USASN1300311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c48fd1a8d1d2394ded23c7964b79f49990cb1c91c7e0f51ac3a0a7383706972. 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/MX2971100216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5706ac17320d2722eaeb3402ac22160953f89b76a6c92131ec8bff0a4d1e09. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/MX2971100099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9e7cbf725c879e77febc72813b0f6f02b74a3591b1bea316cf427b9b103f05. 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/MX2972001973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73dc0b91b7c52c072d49d88f7149b572b189e6ec94d6185bd3662ba022bfb8b2. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/MX2971200389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc03867f533ef1d7b7f49dbcf422319dce28ac70887cacd584b1767e36d62bd. 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/MX2972001975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc735c863f46b484be717e6c24d921a267a806519fa88a8cedeb5de288020982b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/MX2971100356.