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 0xb17b9cc94e2ddae7ac7ef3cce3a4935e92c0807071f2ab94d871c2d53896c913. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8bcacb44-a141-4c4c-840c-6884610c16f3.json and https://artists.proofprofile.net/proofs/artist/8bcacb44-a141-4c4c-840c-6884610c16f3.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 0x2d0c82c2da28bcfdef162c8932701e70f6b13efb561e1ce766d53a5f1ace2155. 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/QZHN92215769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd958a3fc68561565d7e9f1ee7080ff833cf091a777483080ec9e00b72ada060. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZNWX2269720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232701651464670251870520352b5396798e3ddf5000b020d224d25df542774e. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZHNC2340340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2dfca39b8c9fb66d47184591aff149bff5c82e2c253f8083247f3c0cb69f3b9. 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/QZTAZ2411359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9915120578dd0f841aa9dc7cef26a4212a3bbfe642dbc99e3e7b629a63598283. 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/QZTAZ2411360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37224b589da01fc9942f293f37b93b3b5c7bf3f2a8513579aab879f7d76c348f. 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/QZTAZ2411361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b521478186a9e110834ca7374c98303e9a42c5f2645a018a60114e9db75b89. 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/QZTAZ2411362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d03cfd286ddeb132283ca4b833b5d2af0f5d1e0d94b302eda0b3f9dd1e2c579. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZTAZ2411363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a4965dbdf780b24e0f72fd2a1d057c7156508c5714684fbf430c9a0d466518. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTAZ2411364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4378bdcaaa3a14c4202f8afcc1a93189c91f17ecea4aff5f3e6df067a3187e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZTAZ2411365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605c007b21f42fa613710146d0fa25aec1776f054f6304dfffb51280322bc0bd. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/QZTAZ2411366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677d5b3bafa42a73c920f22d12202904a30fc3100c1ffb9d0369d3e12ef06e45. 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/QZTAZ2411367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75431845508937e1795dd5360888580fd0e76bceb93d30c9798342007a8e32e. 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/QZTAZ2411368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af2c3161488da9344219b2f2682642f17c4039a0452040f4ef1451c43242468. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZZ7L2499597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d346e0443f1b1291806d4ce8ae081e4fe0dc31050ba5e9f9ec8b1c09195a2f7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7L2499598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ce20342b6810b6b2bfc36d390cbbc7c0bf5ccdd6f5d1058b66d59a5177bbda. 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/QZZ7L2499599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc656a5eb50dbf14cb4b35bb1ec36801760b8ef98501f8c274fe2150584fa9e8a. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZZ7L2499600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80665042cc879e80ed4f44ceba155de0725b340b0b21fe95ae14acd016308870. Chain 2 (Bitcoin): anchored in block 958042 (2026-07-14T18:24:07Z), 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/QZZ7L2499601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4bef4785c8f21735380c6988a999a69b2e8dbecb9b06f7027a1b2a2ad5d1c3e. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTAY2521432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3b52d536249485926ed721f51f4a2102c4f26ff9e833839f1ead6b5e2461d9. 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/QZTAY2521436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb55be275bd83e8afd6306aa924294fdc22e25824fa3c089f540031cad0f480. 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/QZTAY2521439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196312511ef69398aa3e9d75c1c70fb81b528a60a3deca4dde075b8508e9716d. 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/QZTAY2521440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253a09ea7a38412ed47393eecbce0931a0d941dc7c7b72d1dc3cd210c1814a2e. 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/QZTAY2521443.