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 0x9d7f56b1f987c396045536ccb09fd1fb93c8a3e5a95fe4b8007be54c837b5a5b. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91a4cd99-91ea-4965-b36f-c3c02363e48a.json and https://artists.proofprofile.net/proofs/artist/91a4cd99-91ea-4965-b36f-c3c02363e48a.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 0xb87301780b667bdd39bc6530e4f6c124042814cf07c003f159772fb81983e85b. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZHN32577336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2e5009840f978cbafbb14272ab51f9f95d4a99bc92653fe6acde6c5db18570. 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/QZHN82558969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27cafe46afa4295705f4f8e7686f15ec319d4f6d9f1fdb557ead0dbc3f24e4c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHNB2547942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25448a7c49be5b4c337bfa1cd1b044f8aa3e967e3fad009bc57cd94f6714c22. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZK6G2573795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d8b7d062ec7bd2a9ea25ac96013aa9d2cad579124d9e60e8bda895fee8e19c. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZMEM2509407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a760337556d92d0386a030370147eada23c0a5fd4b2b793eee97f8bb2aba19. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZNWS2592709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05425796ce12bb23fb80a8bb4036bacfd92607fe67bef9b94c2ab14e6b527a96. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZNWS2590910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc444ae61c74241723a38e2f061173770f4ae2400971563a34c3eb7b949f10c. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZNWZ2552180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c65323cbbc711744135c2a468de0533257201c917235fcf6ee1b46d8c9333de. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZNWZ2554697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6de5b8c26502c3b4948d7599038cc2f1ce2f684c90c8c97fe4e6b540bca50bc. 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/QZNWZ2554698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147bcb3915ff39a83d1a56a632247b9e5a9bc875487b93ccb057a86b8eee8587. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZTB62523062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53660d09370a8187ca7bd78920ff792e4700b8a6d28d3e10ec0817e15d019342. 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/QZWFU2585100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x834c83d5f09aad1ceba13e78878420bc43884d53cca2d6a112a1cece1b4b6786. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFU2587668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fad4ad19da814beaf6a791f73bff974d398719537202ea5233e63715c0259d. 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/QZWFU2587672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6117539646040409cd548d83515dde15854257b54984c3b3ea11dea478c94758. 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/QT3EX2524070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1ced8bb31752e8e94171e3488369558c0dffeaa327739df682e3674c78acc6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QT3EX2524075.