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 0x5e49cd616276f90d37f0d62d646da99398391c9de30b3451ae141d77fa5c8ae7. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63e587cf-9ead-42fc-971e-9f83ed0625e0.json and https://artists.proofprofile.net/proofs/artist/63e587cf-9ead-42fc-971e-9f83ed0625e0.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 0xb21e75e0b945a98af995bde0828b409cbf14f33b02df691a8be12b1cb54d572e. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TLVEM2462708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2925e90561defb1eddda855d6a9603c1e98ee6312c5df76fcc38e71e5dc69f. 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/TLVEM2467007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85db1c31e2ae1c6673e879387f9f9b47aa971bb561c680a95b72baae03fba5e. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/TLVEM2469128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf982cce058e95eda6a2d4ecfb0e4a4a747b9287e59cca025e2bd6f0517781e45. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/TLVEM2475258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e4d90889739ecab3a1027628399bedce7528afa995ae89a2b3439ae4f4b802. 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/QT2VB2405800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b600c839bacaf5e1f0c834e1dac57e4438edc9123412f1013b7a056d9194585. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT2VB2405829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d4745ae17ae37fe02dd41cbf0f6789f2ae33cde0e64fcf26dea41285cf7b66f. 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/QT2VB2411796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaada553efbe55b8054be1b4db43f1e9a72ad1e0ec6bde808b99e7b0dfc248824. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QT2VB2413497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119dfc79bb3a16760b6fdda90034ca330046e8fe8fce28f7585f7f0e74cd5b23. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QT2VB2413365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f03bbe97aa92c3e93732fd6f3d1fcb51a49428c1f0b0bc8039a6e3cbaa56ad. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QT2VB2429389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e023ebc6ae67d13a5a272ddafc7335b91ce800b7bfcb596847c1ffa0ca20464. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QT2VB2438448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be9060424786a8c8b8c65287d1390114f52f74bda4f8198a914156b79d3ccd7. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QT2VB2439681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319b62fb4cf8cee75d710725c92d07ac08c8c1c3ebbff81ecc50481f8b88208c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT2VB2445743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c9d1e73f9541efe61923972b318fa63bb7302483730ba4faf4cce611fd75f8. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QT2VB2449649.