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 0x3778a84d1af795b1d0d6899c83a576da5887fc433d2bdae2b5587250c8c162ad. 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/aa19f46d-b220-4347-8fba-de044410a798.json and https://artists.proofprofile.net/proofs/artist/aa19f46d-b220-4347-8fba-de044410a798.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 0xdfac3b1321b9ffb3c8a7dd46cae2674d5d7a500ad7bbe4ed163ba0cfe003b1c6. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/GBKPL2290070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee693846dc79d9d27f7885c8f0eafddddfa07ecafb550d3c759c41c49c19189. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/GBKPL2210198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e80e56e14529d465a67967752c57ad3e9714ee0faf2e5f0bb3c5f088c2f4e6. 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/QM6MZ2304452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9807266ce47fe264f03ed0f03ddc7b81415cc813b173eed8531eb8f349fa54f. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QM7282317054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f8e5f93aea57e91eca928e038eded8877066ef955d4cadc53b9519f2e82cd6. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QMFME2333666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4b6b0248d387768191aa560236d98a678bf2f806218c668c60911d83abf15d. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QMFMG2371038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84cb80affd0e3cdb2023c6feaaf84daa33838e66de535fe367d6c44bce9c7fb. 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/QM6P42414342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7995ea64b8b80c41e188404cde5b1204c01c11d6d8c600a775e4b53319087643. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QM7282494802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bf83596f030ad462b0c8129f5c03b8a7f43553dcc029cfed0d6962ce5c228b. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QMDA62409671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e335b21750564d8256ed5d3bc6c1b2a8456436f682bc4b904898e6ce9db918. 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/QMDA72431695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0bf83596f030ad462b0c8129f5c03b8a7f43553dcc029cfed0d6962ce5c228b. 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/QMDA62409671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7995ea64b8b80c41e188404cde5b1204c01c11d6d8c600a775e4b53319087643. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QM7282494802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e335b21750564d8256ed5d3bc6c1b2a8456436f682bc4b904898e6ce9db918. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMDA72431695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73356d1b2aecaf7e327370de98dfd8bd07375702151ee52af71c2896c0f95d58. 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/QMFMF2435922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a508d6e9c3819916a25ce737c6532781802547642aec38b1061ff6dfa56f87f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QMBZ92545649.