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 0xed5a8a62e134b61dc97254ff6dcc3fb36a2c395f959f365da5c7bf28a6e1798d. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4ac829d-1c61-4c94-acde-9b33846bd91a.json and https://artists.proofprofile.net/proofs/artist/f4ac829d-1c61-4c94-acde-9b33846bd91a.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 0x7a8c6ac610c5a9dac49777967e648ac6e884e4eca7bc123e9341813c7c651ee1. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/IL5841521941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1531ad84219c3dadfeaa796d83f0972157a0953358046d2e6604cd6bc581533. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/IL5841821937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c4f30d098c7c0233a8f718f7adeb36e6dd0c054243ec880d2671daaae6be09. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/IL5841823345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465c48457de56032f71a87085f34941cf667b6e244868bbf519fff34cf85d420. 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/IL5841924574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd6f4377f649300b832b7eb971ce7d6d3e6bccf4c95ea83fe2da0e5600457e2. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/IL5842030350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e626aa925075c913dd92f18869033ddca15585e4aac64d049b0e9d19644700a. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/IL5842133929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac08dcd87934965fa3333680ec59f7076cbeeec1aae43c95f364e084f49b141d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/IL5842340678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8386ac22a64d522a5d69fe257bd8587e0f4c24965c4b768a8c2146945fcfef3c. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/IL5842343555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904e751703d60d2036b5a15ecc459d8119309318b1e662e7c65e7e8d71d30cc7. 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/IL5842444781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3725fd1c75c7e511fe753b3b5de88ea90c3af2cdd8d7e576ec2404ae386a61. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/IL5842446628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d037996afaa338736fe931ce3e18183b723eea1f833f6a25db918c301c9564. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/IL5842448171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b4921c6bab3fc3f3373f6fbfb6da166a07a75cff9b1c0a738a30bd9bb7e7eb. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/IL5842450031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29c784a9eaaf68a3aacd351da018ec8adf326948240e747154e8cbf13ec8b5c. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/IL5842551618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655be5dbd26c881771a774c36f1d2a9e5e800722df84f1b308791ecc725e22bf. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/IL5842553149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99395668a3c179a9183afbeb85e16884a406c580afd7d38342946ee61a5cb99. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/IL5842554700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cbfa4ca9babc92d718851eecff591307f50b5dbde5ca7b85c875cee90012837. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/IL5842554701.