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 0x4138292c258e13669a104444818bba372ff475431ea76740b05658b44b250b50. 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/8d1785a1-ab63-4483-88a9-e2b08184e8c4.json and https://artists.proofprofile.net/proofs/artist/8d1785a1-ab63-4483-88a9-e2b08184e8c4.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 0x8dda61e588e7ce334cf3c2380366561346cd90ec878e886631e4c299ce810552. 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/QZHN32005192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd962d04a1d7f5f35f65487f7640d695edfafa2c3f3c31362cfd7e53544029496. 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/QZHN72085719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1551848468507f7b8319f922c57e54efb780e61c436abfa63909f82a80bfc31. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN82071190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa817cecaecf13b466b36b9461e2917701771e1d93cba8e774a20fd63bc3d3781. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USANG2101540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7988bc724c8a92bb911c202234ce0e9e19412b79a794e89ad7fc0d89efceb0a3. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZK6P2485416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac09cb75d4c596873dc79b03f7b808c99c1d3f9572ed3b662d4e036083f371c. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/USANG2107147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a7923b2c369a2cde1623c5d14761d060c9b0b73fe5bf65789fa5dc41a35667. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/QZK6K2122679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44dc6edbea86ac199b3795fdd17707309bf36dc387bcf0db8c3873a2b35c4855. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZK6J2132954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ff7b23c64459bfc4b3889aca2cb7a0ea83aaf9027e1f9fe1b8ca8fb4d7950a. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZNWQ2175780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346ebb807aa6cdc50c4435840bfd06718d0c484a2ff7547156bfac5cec305086. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZNWT2146651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa809f945b5f0a1b603fd2fd32b89b008a3d052352122acfe2f762c28d068c8f. 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/QZTBA2219288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5563badb9167b1e16d7ef104ad975cca70a8cc684d56658808e2453e1a91fc52. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZDA42331921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223037b0f6823f6d3c918944661626bad4744823383df803fee4adc9f0286d20. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZDA62316918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2c9e0c2c72d6055ea4205d1d2c677f857ea60349db3762644986fce8fd03d8. 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/QZES92379778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a5996d0e2bcfa7d3d412f04253fd561e7d1fe59e0f485320e611507c782181. 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/QZYFZ2383123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898e2d1d610283b8bd3c141c410a5a27c2ff8618316cc0c70549b0fbd732787f. 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/QZYFZ2387456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf5b1604a897d6c51a1d3a071f877194fa13d798afcfe510d17b3a6c8209b55. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZZ662309950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650f4cf833e61ba4c68b72b754f77e0855aae1c7a736a596698ff360d5441953. 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/QZZ662314527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a704b51ff744c279e2c57583b80a791341a656fcbd9e29d9f8f3ba1282acd2e. 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/QZZ662323844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539c97ee951b78191d754bc1f4f81d66e07bb5ec0715980d020cb22a70be1630. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZFZ22449721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35354198bc094b06c866f77a8eac391e6f161149ac76844eb90c0d529912255c. 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/QZK6N2490781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb8047b57532b78058d3b55e5b2a2b186b590123ab3a5779237a7c290415ea2. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZTB22443806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e5e2843d6702e0b31aa7f2f1afbcfffa6fd091299703cd729a97b490e486f5. 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/QT3F42463542.