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 0xb7ba891aa0557ce7f606f28cab4019d29160be4735cbdce3974fff0a6b2856f8. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1f26323-7a78-40bd-b0bc-2ffbd8c0a77e.json and https://artists.proofprofile.net/proofs/artist/f1f26323-7a78-40bd-b0bc-2ffbd8c0a77e.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 0xeca01fee039a4919d71aa4093b7626f2323b58bce89f554b91b8d3d33decf0f7. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/USHM91114393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b3900c60b07d0d5bdf23ac3df42033bbf3ab8cba3af466ef8ca73726f65224. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USHM91114394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808a38a8cb3581141ed43c7af6cf8ed0ce54c01ff1a85a6ddd8a101609282a2e. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/USHM91114395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf8e4eff155ab2116374fecde076119e939b0afd18effb259b2cf3a41b68a74. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USHM91114396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9da34bbf1dcebd367c7c43f34256b4ca8f0e68a925bdd5b786fd6b969b6782. 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/USHM91114397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d923413677f1d61575adaa414495c7945bb7b6682bb91231fffa2b9aac44762. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/USHM91114398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca5918045eabb77b73c824d3eb132153248117cc9ae7764be9fa9fddec9f13c. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/USHM91114399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66eae20281d5456339c47d9b4d3564b8e984208b102ec9a5ee6cc06ab1d984e0. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USHM91114400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ece408ade4b56b085da468c04ad72215b1c7e35cb304fc383cf6e5f8aa05e6. 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/USHM91114401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cac8f8b10ec22dffa374f084b0a41069d805b16455162c7950ed44772178799. 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/USHM91114403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f332f059283ad7864d237f9d9c3ed9a8b846f6a9b73f03343b9004b8eaf24f6. 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/USHM21472529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587b23071f03d72b16ac300a831cb5467d6f61f9f86cab4edcb6bacc2c245647. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USHM21472531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead5febf0ff5bb83fd01b12b27eba0e8c55cca213c0646ad3eabcc8dbfb22566. 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/USHM21472532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eb33c906c9b37d9f44ebf2a71f9b15e756f1663f68d8b3c6f98679f7b9c3674. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/USHM21472535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad48ad1c4c2bec667a99227457a4f25fa8e9528c94d46f6b9e1cbd51700d759d. 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/USHM21472537.