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 0xbabcda05b6b436fddd8aaea19139e4c223ad5adcda8a5f4dc9961469784a1ea1. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/741132a0-9f5b-4a18-912b-b4417245735c.json and https://artists.proofprofile.net/proofs/artist/741132a0-9f5b-4a18-912b-b4417245735c.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 0x3a52db475c64c7d8f28457bf89e18369dd90a02017a1adfcd98b0832b0b5ab28. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USHM22118694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f77db450007f67f7d55e7c1c5d2820830feb486d17b5251f151fa103aeccede. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USHM22118696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328cb2629a82dca1d6346d0ebe0928d9b73c1f83742bade2ac13013441f3c459. 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/USHM22118698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4a7ee24e1184a19bce582a1092a6ff959bba5cf104b866f88feebbeb513558. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USHM22118701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f96b7eb4830546561272ac983d1f72de43588eed2cf3b140edef68a2a91cd05. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USHM22118684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb878faa07487e9bca4ae7b4a4601e6dc9ae2a6e35e03aac6fc803d223d75966. 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/USHM22118685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb001bf55bfd94bf6bfa5b55d3beccbeea94b9c5b5c4bec3d1a365c95f42a7c7c. 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/USCGJ2385718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f8a105b65a258d6f5bd719891ece2ea9a560aa03bc36a667ece85bf6ba42de. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USCGJ2385719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515b804fc24caecc4cfe6d082f2d57863ae715459458fe6f8da815ebd9da894d. 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/USCGJ2385722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5126a7be1d55748862262eb0eca5faa6882d464044c334e34518c2f30b9387c9. 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/USCGJ2385709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3e4e1df7e56a0e1cd74fc4c392a4254e6d3bfa72dc91ad73cd541eabf8e1a6. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USX9P2013649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9bca6095a41d2bc3094c0af66be0130521bc9e55cbd228b1842cef85362721. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/USX9P2013650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bc3be27ce4f42051b16c2614d76020cb4e365486c14950f08f6c28d98d9f8a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/USX9P2013651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a596df35d49cfc4a7053fb7c68b31919ec545333f905a59151eb9770d25a0f1. 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/USX9P2013652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084f543905cbe0fac69b30c826c6629c13fdb64a17974d1f79c2cccff855ee37. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USX9P2013653.