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 0xc6876ddfdc1927bdd7368b5d8d640fa45dce1b8c61d04320c2139d1a4cc1174e. 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/4605d77a-ad04-4d7b-8811-f5e28928273c.json and https://artists.proofprofile.net/proofs/artist/4605d77a-ad04-4d7b-8811-f5e28928273c.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 0x1421b5c488bf34d8732588df9f8a4e1e004752527a17a07e77609068dd70a64b. 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/USA2P2140207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3719939474e149858b3d70a27b35e4a8ca3727614dbc4dd42071635a06b4cb. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZK6Q2271436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5389b9f0d6e7989434db6fd6bdc30be7a8b3cc1cd25ef28c65142f5604c4800. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/UYB282280002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x110ca46255bd164f69043ecf07e33136a95d17f664e10614b86fc636c6c1be89. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/UYB282280004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a5077bdbf7bf88a448418ef2df58c6172c889716407b3389649a7c85f624cc. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/UYB282280005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf569007d943bad680e53966f2c2509ba15a407e8b592b8fa178611cb69bd2e00. 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/UYB282425285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeab5e97ada279d06680eadbda8985b92ad86b2f1815fff293cc724a33196676. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/UYB282280007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1639e703b3a573de7ec4d97de4aeff85c3d8beee13d53e1eae8c12b8a6d544f2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UYB282480000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5dbae049ac2c85ef491f33655fa4d0fa4007e51e0238d024bd2d5df5ed4880. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/UYB282478219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe359b110e7a06473768f74b9016326b7b30e6aa6630cb0caa2d963c3f71d1f92. 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/QZFYX2597650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf077acb6347680b91767344fb7b18d732fa2ccfc007de06e7dddc2d7f314f3c7. 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/QZFYX2597651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97317aef871fcf2cf66885de893f5c557b096747a2e290637c9857174744c60. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZFYX2597652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4acd5d87faccce9ef6cb1f372cc6bc7beb9d93abddc19496fef30bec2af588c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZFYX2597653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f30c250efc541371ca31d48371b61e108a10f1c9df20197756362352038eca4. 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/QZFYX2597654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce320f66ad0b540e725e890e631645dd85c9b88d3a1e2257988cd16df9953ea0. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZFYX2597655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefcab3f5dd8fa34d3928cf17b98894886a837eac8a09260a433ec56be19f3b89. 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/QZFYX2597656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd874683b03db3fde81bc4efcd4f0b964f575e3e1012282ef0c06cf4ae1434e9. Chain 2 (Bitcoin): anchored in block 958654 (2026-07-19T03:55:30Z), 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/QZWV32579455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c2cd48164a794a6eab4837b61b497c98ac2ee88b36debecb1de7be7c3f74b8. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZZ8B2513747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe83bbcbefe1d63a39cbac6139a16a64fb199d76f30da46368ff964e46a0b645. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ8B2513757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d264f8817034c87e71f88ec36a69a7d60d55a4a033500409682128e3bffa4d. 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/QZZ8B2513761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca2770096d1cdef6ccb01dc215aa73219b11dadf5bfe3e7862f94103c590bd9. 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/QZZ8B2514109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5c10c24c0d0096d69093853c005215af24a37f40fa2d74a197e9ada8385455. 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/QZZ8B2514169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6b92ceeacc6dea0d9cea74d56aaf14cb31ff2ce7ee57bea7f03c700cd80b64. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZZ8B2514181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ba2d5f1a68fd0227b3e98d02070e129a01b2576606a46167f8f0b81e27692e. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZZ8B2514249.