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 0x33bc90a0442e2cf87045a4723e4a1e297ba4f90f2858519a2e5723877bbc24f6. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0090db8c-29c9-4f1c-b44c-19a333eed5bd.json and https://artists.proofprofile.net/proofs/artist/0090db8c-29c9-4f1c-b44c-19a333eed5bd.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 0x7c114880480e6bb63088aae093cb1b415a821df9f79e1606326d0c1bc241605f. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZWFE2481849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a6ec98a77bf727f0a7cf33917a51900a72f9e075e1a639cf6ff7891a97401c. 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/QZWFE2474556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ab5641b09cb8aa02a7ff57380236c8f9cc8663a12f435fead0cbf8533af616. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZWFE2481841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55434029bba85af9c2492c56714f1a609f1c72e3d5b1fb434e4e602b7b2c3dea. 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/QZWFF2481183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4657afdd876dc1781dbee2917699063b60f144fac30aba2a16b6f0d180b57615. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZWFF2480417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80071b7acea12ae6ff37e83e2353907108231c46f1f10e976b99f3ddb6c48ad4. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZWFH2401549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eee01c2f95af44538bdd00ee54948701783268a0e58519d4fdba5060c2af2f4. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZWFN2401060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689e64f9c572d5d33566601210bbc06ee837177cca2d3ed589ab6c4a4049d0d6. 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/QZWFS2484704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df29f2e8f3776825f8556abd41b607ddf5f96b065f7dbedaa5d4a35aced77c2. 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/QT3EY2471344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fbfa790516701f6131bb16661299484722a8b5b6584c19c3789c760aa2eb12. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZFYZ2566903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947502e9b5661d6382c1353f60c88d4e6fb84d447124098864b875b316f05874. 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/QZFZ72588240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55031b67967adfdab5d867dd7c38171d8b79d886f392edac4b44e64f10d09ddd. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZDA82517505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9ec5af10f7568e06fd54d98b36562e5d178034afaabf786f2e6a3f41de1cae. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZES72564469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1b21d16e70631e011e03aec374ce2a0f2f81172bc5b28588626dbea6923118. 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/QZHN32512174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3feea6600e2567de1ae1ca9aca4f4ffe01e500201facbe393d291fbb6c21b3. Chain 2 (Bitcoin): anchored in block 958143 (2026-07-15T10:15:04Z), 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/QZHN52540938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9eb614e042fd5744bc28b61d70560a5baef62db702ae0271909c86d279e07c. 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/QZK6N2574047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496f1c3e883dad4c2eaa3d9388309844c89616da22df87b7947c2153fed37ef8. 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/QZNWV2549395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d7c6d846400c812e5af336cb67c100ce54713fe7132c829a0afa9793069387. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZNWV2549396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3030f8f02c3a62d07709d4e75276968dea1b90e7a73b18b0e93441f0d12967a3. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZNWV2549397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6230e30562d0c2b0a4cddf982cfd0bdfb5d5e45aa9261a5c5261238877dd862b. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZNWV2549398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd644310ac1fb2d7e2b8724e6b4b9938aff0fa5b039464649bd8aa8bf01812620. 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/QZNWV2549399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a2c8a2bf7a5bbb7d475b34ad088ac0592bc3dd17fd8591f2c6b4c29e616843. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZNWV2549400.