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 0x7b07074fac79b47dec77de2684ac940f3fccab5a30c379e5ad5d2139a6af9ab6. 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/5818203f-2f03-4b4d-b3f0-6e79ea065d20.json and https://artists.proofprofile.net/proofs/artist/5818203f-2f03-4b4d-b3f0-6e79ea065d20.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 0xe3647e29fd6bbda507def61b307f71c46efbbcf815e55b93b88b5b6b534efece. 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/USHM80658069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659c5e101cf9e508e5d46f942a5121ffbe1c345f0006fc9ba81b5a763a9c47b3. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/USHM80658071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074a66901e2b35c45e2884e6430a8200594cfe0aca8f9909901d749cd79a8fd2. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USHM80658072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb563c83f5c108aabd6c8bb55c729ad76bd8925308f78a90809709603bb44e4. 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/USHM80658075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeca47df22bd3798e9ec27789e40c0483d5dabaa77a459adba42005eadb3ac76c. 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/USHM80658077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37bfe344ef49a9e2d25aaafe72edead912d57f4cf59793f9df2c65e90185dc8e. 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/USHM81536208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d8980034e674af222ef432c4cd7ca0313f6a0ebde48ed4f15a6c7b0dabd9af. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/USHM81536211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9978df9f50e8efab8cc6fe044f35951904e3d64a9af868e8e036083cedc71b6d. 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/USHM81536214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219b14b22adb3efc4fc193e1b10c83c17dcb3de6b4e52d8122d38a3d97e1190a. 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/USHM81536216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6723fbec7615b5f356a21a13ac1e140899d5025e6721f1f326683d0c7b01415b. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/USHM81754804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x777ec992b083ba500a09845eea32ba6d96794c8ac1a48f3e9156408d931972a5. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USHM81754806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8566555963d2114100898bb0f94df98e1bfa8be6bdcab82dd15b6ec3d7917a7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USHM81754808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea57819f5b6f471e3ad43577aae92759411b4a991ba8801f99af8c0a449126a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USHM81754809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe784d97ed085314d0a10121e9e2a244345dd7bbcf58a507e29a4344539118f16. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/USHM81754811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14fd67463eef35bbc4851c6b5ab38803666da2ba20174acc7a5b09af85ab19a. 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/USHM81754814.