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 0x3ea2ff20a12e5a9f8b5d01404ba0a8129b8d626eb50fe7067ee45fff380e44d7. 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/a2b628ef-3a37-48c6-b853-ed3684edd9a5.json and https://artists.proofprofile.net/proofs/artist/a2b628ef-3a37-48c6-b853-ed3684edd9a5.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 0x4c7185b22ddbf92db7edfcbc4a45361f21f91633c5a41113351375d7c9a3fd13. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAGG2263480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3a3a401fee4b7ad630bd4a0ff3ee4e53e45e6854392a898a37834bc4f6c219. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/TCAHW2429991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9770e24c9cf6c7a970c56f6c5e5bc366d18714672a1dd8085cbbf7ad20a9384f. 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/TCAHW2465696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3a3a401fee4b7ad630bd4a0ff3ee4e53e45e6854392a898a37834bc4f6c219. 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/TCAHW2429991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a00f153540c44a2772ac74b192d74986b9e3f8c37d5f0035db594e6717b2d84. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAHW2465615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9770e24c9cf6c7a970c56f6c5e5bc366d18714672a1dd8085cbbf7ad20a9384f. 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/TCAHW2465696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fd40b68624af64bde5d198366af44a5287f22b84ba6901e1abf83566d38241. 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/TCAII2472009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb153dba5e1b75d927a50b4000d3580c306d72e50f737df000a7b64c819a85abe. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/TCAII2472102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01018c20db19ebc538d7c27efb6b05326019ce6d1d5680d40c017382038c6d19. 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/TCAIN2476991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e218ad5a7495fe8742fe18592200ebca8101a1bb92e0e83348cf7f30754277. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/TCAIQ2483805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3d6808974baa450bc13fd0930ea777c18e5e5c888a6f1d29c68e560e05d813. 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/DE1BG2300143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51297487abeb22c43fca285fd5a62166b706c9819da22ea848c24063f6b5518. 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/DE1BG2300141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed353311dc77efa106abec381829f3a1d2867d7be6ea39e9188b4eb4d649b80a. 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/DE1BG2300148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2947c58502fd9d94cdaea161db5c3538d1710905b63e5dd66e4165db2d9c2c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DE1BG2300154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7d1ddff63a206f9eac405a9c9c0fb83beee95859f65ff45b949c6ccced3041. 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/DECE72401522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7d1ddff63a206f9eac405a9c9c0fb83beee95859f65ff45b949c6ccced3041. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DECE72401522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7d1ddff63a206f9eac405a9c9c0fb83beee95859f65ff45b949c6ccced3041. 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/DECE72401522.