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 0xbad7d7c1cfcb3fbcd49a50d9bd2589f9a57753634f8f4b771541e8ee7d2d08a5. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e90903fb-6ef7-4129-80d9-22f4186bae3b.json and https://artists.proofprofile.net/proofs/artist/e90903fb-6ef7-4129-80d9-22f4186bae3b.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 0xc6984a35f22a1274345ed66c87b5e196ad3ad4f3cd20755faf67126ea0920e89. 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/QZK6M2312396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bdea0bd1a634d0877078d47b243de0cb00e50675111261e98a3e9d9169b356a. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZK6M2312397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ccec71dabe1229fb00fb660c4e9ec79376bfea5f9cea07d877c73056f29c86. 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/QZK6M2312398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57816f94b09087fda329888ef9b9d8eaf03428de024e4d8c477afe258b5834ab. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZMEQ2340116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66319217fe7d2091bdd6e314471aed5eaf7ed1488979409f56c107c924e18c8. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZMEQ2340117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfe3db89107ea5a57920a35d1b9d977222b4cb208a82df84c3d11b3beed242f. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZMEQ2340118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae754258b60c49a9769ae52083051beb90a612cc922e9575daecc5cc8e03326d. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZMEQ2340119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef3eb16951ffebec00928233ee6cfea036008e2a4a72076afac207189227abc. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZMEQ2340120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b2a27ffe44a3afd3481653983855afbfdbf8f7f49c9f01f1183aa93e0f874f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZMEQ2340121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c6fc482ccc501e3b7a5fdd062e9e543aa0a3e03b6a509d72616cc316d4f556. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZMEQ2340122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c77c123eb113d12cb6e72c24b2300e67e386317aba6f27f3a59c5f486dfcf0b. 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/QZMEQ2340123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff90e5d26b4fa8681d30f8ec9cd33fad6327bcc91142d65d9c161d749a8571b. 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/QZTB42373485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05fed5060c2892a6a52b933c9fdc6d56414fe9b9b0c56fe254ee8a76774a380. 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/QZTB42373486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552579c81ebbcf96983751d025a6cc6d73ab05c96fc9cfd356df4d77a9bb7e4f. 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/QZTB42373487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b632234112b871321da7c0d5acdf1208578d059569f67e87064081827777f97. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZTB42373488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce644f8e709d1c105465cb5c26d95d87ab6712b0bcf3ca0ca34deefafa36bb81. 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/QZTB42373489.