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 0x8ef191b0edd3d946c602f20a390bec9279316cd187b4c8ab180259340bc94419. 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/7ad5fa98-7bd4-4664-bb2a-88dba2216a18.json and https://artists.proofprofile.net/proofs/artist/7ad5fa98-7bd4-4664-bb2a-88dba2216a18.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 0x68e6150aa091b2fa8e1b58963a62252ee29c34d6e57ad6892884e67373880d1a. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZDA81992849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33743cb8c4b0ac983709ae391cb21c5a707ed746999e15548f488bc3fe1968b7. 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/QZFYX2095755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7c0c6c1ad32ad91b69157b87414196250eeb3e41fd0f791bd9cb0cd3769033d. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZFYX2095759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451ada055688b2847dc4ab72394c494a19348c9c2cf09ef01b001540ab87ad4e. 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/QZFYX2095764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6972d993d7abad1ed1d65d84eb0396a379213e1f5cc91adf4cce679b02cdc6. 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/QZHN32043617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6217da5eef560d943f12ea67daf35a813492269a110f5b29717b45b171552368. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA52037256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c69468b3c4ccea1261d9f7f96edd9321f7214f489420ae61b9ead7918e1114. 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/QZFZ52199899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec7c21e4b2a25791e97682e46b98e5a1444765c57296427630bc130cc1be3ec. 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/QZES52186734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a6923fdb1aa51834be2cdc7a6e2ece699cedc9eef4b6f5578ea1c255884cae. 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/QZES82163278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cfc5d5dbd87ba8d3813ab3e11bb33de7485fa0e09350549540c054f0edc782. 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/QZK6P2170986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a6923fdb1aa51834be2cdc7a6e2ece699cedc9eef4b6f5578ea1c255884cae. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZES82163278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b96c615808ef7c7185dccf4185cbc4d31595a8e4563314ff83cc95a499cd1f0. 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/QZK6G2152524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50597ac88d7b41cf7b54c9367f029b0e3f4be98447aba0e1450d231b42da902d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZNWV2186583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f0a5b89bb8c1e762131ab176fc008de72449d5d3d9223c5aec6397ef8a6136. 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/QZFZ72218678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68fdc7f02ef2497c666b378172c8f0be244a0fc03b6d300ea086a9a959888de9. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ72265221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372ac916f901887b4c969400b6d5553a37240793db04ce382575a43755169767. 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/QZWDE2483107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae6220eecb634877d333de63ab31bb5fdb715d71505166cae9a5bb0fc35998d. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZWDD2585275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9d738061930e3db3a728e1f6bc7cfe4fba2eefdad259b64c36b6333fff0999. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZWDD2585279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9fc5ccbde8e60903e3792f869cce61a7e9879a0e5a92ac3d3a6266ef0290bd. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZWDD2585284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73693c812668f9eac0f88fc288f36558c4d0ddb62d27770d12251a5b094ca363. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAS2187732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52dc644346f90b2bf17b9e376387da225fe7e46da3fae6113c43f5f0335d40ef. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTB92292060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9ebb766b4fc1cd0d3f30057d63c1ba5fe6f8406148d42e8eed66a2665aadc5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNRS2091683.