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 0x3965fb736448d28793cacb0bfefa4fe64c1059ba8792929930a81237fbb3a455. 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/e962de41-4b2f-45cf-ba8c-ddac6779ee56.json and https://artists.proofprofile.net/proofs/artist/e962de41-4b2f-45cf-ba8c-ddac6779ee56.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 0x1bd6b3646156861a1a0e140552ad52cfda8815768a5242af6417ce01c107b3c2. 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/ATT251402220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c88b047a5deb2429e06064c48e8f2151a9143490098f736439617f875627d0. 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/ATT251402230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb727ab4f92349aa85fd586a56aba11c1df4a8ea1d39c3d742585ce47dc2080f. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/ATT251402240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e5b502f75dd1cad6637ec61b8f6fe2120a9cbd175f9a2cf2d99719609b2005. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/ATT251402340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1d7ac5e558ce783a61a24908853f1cc0dea5a6152d64f3014578c9cee0d558. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ATT251402380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa820b40787097da0ab4917eae4e983505c552651d92c09eb7635c55deef995f8. 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/ATT592400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3e0762baeedcab820cb9063494616d098a7f98446968ec543e25668a6d458c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ATT592400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6140957f84a9e325d294e039c7d0395cd30cb2c3761277588a149c557d29ad25. 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/ATT592400117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21564f5d83ebe478004777da2819fda8881fbe60ba982f7649edcb4933de8a0f. 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/ATT592400201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38082fdf60adfeb14f6587ec93a1493a628872468994d9412cd967ba0360dd5b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ATT592400202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5633f254a495575f44f7205dfdb94040972a666abf861080b8e199252e6138a. 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/ATT592400203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee1288c7a19ce5840be68ee28cc5c943714fc7b2585f5da567b0de22b94df7ff. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/ATT592400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7384f984ecf2ed5837f6008dffad0582b99ed32355a89025ad0e921fbde1f4c. 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/ATT592400209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c03dc7946f5779e79322add11206e1c2387b08c3094fa41ec55e5e815d08954. 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/ATT592400210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa21c29c905c8670edc4222d3f2dabef0f6064ef59fc7bf6ebf01b2a533152fa. 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/ATT592400211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23c9a7eb384dda559bf5582c05f60013cccbfe1f210e6dd9f8cc11f3ef038ecf. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/ATT592400215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa20045723e589f2c774ad3100bbd82dad8a3deed7193d583555f6dfebfd273. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/ATT592400216.