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 0x8a0a51b188b22c0dceb67c20bf03064ba0cb3a5f26eb3cbc96b6cddc8b9c970a. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/68e96ed7-b98a-4a11-bad0-9f5b2ece9075.json and https://artists.proofprofile.net/proofs/artist/68e96ed7-b98a-4a11-bad0-9f5b2ece9075.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 0x93ef758b915a3dfab806e79daf4a04314feb2d02c4c6da4c9b95ef89fe98f1fa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCADW1883115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5342912848e84608301c2a3de61625f255ef124a110104619136538955118e90. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLF6Z1800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96ebbf71875a249b060e09054faf29b9d5b302784b6981b0fc781e3d2953cb6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLF6Z1800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf370e2edca3f39ef60fa93847c98d30137dd182d28afa596a56bb6042462beac. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLF6Z1800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aaebe6cdc6a08afa13af8b1e3b68bdfc70dc65eec5bb45e1e045cab8b650478. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLF6Z1800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x875197f46ce9a4b472c2a3768db8fdbdf8d6c9e55d22a08bd65efcbef5dd1ebc. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLF6Z1800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404bfb21dc1c3a311acad44ac98100d5f07c7c64ba81a4b39e02663861f39615. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCACT1628837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342fb05c6ebc1845a8d0f58f4999fb3903662aa2901ae8d58472d85582bf0ebb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCACT1628841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d277dad5959bc38c52bc401e60e1a7591419d5055210c34eff8dc8e4530b4d2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCACT1628889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a40a806fe1c8ebdcadc6e48f79d7f5b99824968f91c1fbc4305902a5706534. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QMKJE1252301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c0e66726909ec44c538c5ce3f1699120a00b9d245335c22ebe5a9fa25ffd27. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QMKJE1252306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e34d3dd51c7918e42d3bafa1260bbea22856bcac8dc2dcb1a89afe98f109614. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMKJE1252310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978ea5053cbb55c9fce88786b103c1c3ea499703a81d5c148c21bf24ea4f6326. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEYX82155851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e66e79112cd77c2bcf5c3c4e3a03fccca18e80cf5f6e9d4af286a6e4920541. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/DEYX82155854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51532682156a6b417e7536f370ad66d90b9c9ed1f9587bad672070283fa9ef0e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEYX82155855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77fb4d111276fa203c588b307ef0692c3a8071da48d854341084990586f069b. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/DEYX82155850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cf10d4e2ef70cb3c3d97cdb42ffa8f3337ef00bbb43f2fa51eb0d7b0fcf71d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEYX82155852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a64340cc3a93beceafbf4b2888801746234fca6ada2204c5424613fb1e52e3. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEYX82155853.