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 0xca1b169d145fa54583662b505cf63653c18da4aa325ddb40ccdb95b1314d6cfe. 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/fe81a1b6-48bc-436f-a10c-682e50f1ebf5.json and https://artists.proofprofile.net/proofs/artist/fe81a1b6-48bc-436f-a10c-682e50f1ebf5.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 0xb8776ebc52e023fe8585f4fc070ed544552ada3cf704e611e8344838328984ad. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/RUA491000856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc500c1a340b42d0e7373b3ca4cfc1aaa34060987bb16c7fe7dc4879d43091f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/RUA491000858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429f542e87f8c05f85b6eaaa6374d6db95df6ce9c961b92d2f633fc1abc99262. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/RUA491000859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d88cf9388eb1f3605c72d5b7d1f3a2598ffa17492c7b5be44cac951c908b3a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/RUA491000860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df628136a6d85810cfdb986624debd0737b8976f40b4b42a140bbbd7cfde924. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/RUA491000861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c9bbf0ebfa2b1d1e4c19583a6d6c9ffd867581cb63fa8c8279fdb9e884cea2. 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/RUA491000862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8f732a25ea144045a8dc244ee9059288f0fe382e9f5a8e99aef5a0d7fd0fce. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/RUA491000865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b7cdcc871ae3de9c7ccd4743de3e4bcad0bab5e77e174098db4d0aa0c1049b. Chain 2 (Bitcoin): anchored in block 958676 (2026-07-19T05:43:13Z), 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/QM42K1857243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e5e39aa7bc42252d4f357bcab8f9560a3f64ee8cb28c3ba23b5966e2f29f24. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QM42K1875016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14457f0964afc17de25f4208378d88fb8c3d46d5ee41c9b8fc091988d06323a5. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QM42K1874499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d9d43226282f90916d45a8c380e35f353ff1fd454d0118c95bd591dfd7f22a. 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/QM42K1896526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148c4187739483e8d609e2b160d8a201e4469fa9f22c3c728f2af3b1af2f3846. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QM42K1831827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193fdc97fef77dd4bdd9b33d4ac88e3998e39c2747e6bab3781c4f896982ea80. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QZMHM2016809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c8cb03a7bf4d0bab6f4827a60159153a512ab9c72d8e04d91c71cfd919b771. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZMHL2294623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb993499d2b52eda21445c95c672a6ab8b4f0ebc4a1e5102fd72870ec39c328c9. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/GBKQU2147373.