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 0x03ecc066b547fe21ab6f4c1d6001525e3787070892992d2b85b91030d0fb2a40. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09267a81-b39f-4fb1-a54e-64b904c48bd1.json and https://artists.proofprofile.net/proofs/artist/09267a81-b39f-4fb1-a54e-64b904c48bd1.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 0x4968b325af29d57ff03108a0a164c0cd19d5ae88141dcee0ed5b9143b917ffad. 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/USCGH0637013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b8cbf7e65756d5d626c18d0d590b0df484a67cad0f6a28c055ed13b1d4ff2e. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USCGH0637028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc645167cdacb57b200e0a7666b06073dbf02fd61e73f93a69c662631a0d9ef15. 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/USCGH0642369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4824a703f3df8737c03ebe5b8999f08949777990749ddcaa84b8cc7df05fe5fa. Chain 2 (Bitcoin): anchored in block 958681 (2026-07-19T06:14:54Z), 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/USCGH0642371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522258136cf3def4e15702407436b9a1fdc250db6f2d833ed1ca12c7675ff53b. 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/USCGH0642372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb288273ca559c9d02cabccba3a7cf290c1ab3c815b3e4c48ae351c2c1610c5e4. 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/USCGH0642380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd31e996b117d7a0c78eab72c8844d8645fc184dc339f9ffcdc0cc9ffb6a2a9. 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/USCGH0642573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e9b2eb579ba25b7649fdb84716d852a4cdff2f0d0f6f524570b1ab30152bd6. 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/USCGH0642582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316fad1c4c34cf190a6c98a37b9d2f6ec4b24dc79c50ceb88b939679c5d0f7c5. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/USCGH0642704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5e07a59e24b1abae6bf711980a33ea35f5acae41e93b53139e4035caa9029c. 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/USCGH0642712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99bdd594c68614b70dde25003a4a8078eeb78113729a6209b1921ac1d817ae79. 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/USCGH0642734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d010353ea5cca560aa05c26150902048ef6c01c06427a443383136c86b106d1. 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/USCGH0642739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49b52b282af4771c4d973f8512bb35946e5897105f0dbfa6406c6241b6e280f. 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/USHM21286769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef06d5baf73a339fc9e087fa7f26e43a22ebb6be4f285584fbb1002811c635c. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/US3H81000643.