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 0xcdeb46e219e7303552cfc4210b99cc0aeebd1d0b24c100bbb20a2b517836ea5f. 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/e0e172eb-a833-48b8-92f3-b7adb8d0a6f1.json and https://artists.proofprofile.net/proofs/artist/e0e172eb-a833-48b8-92f3-b7adb8d0a6f1.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 0xc9e4348896e6b1c141ebc7f482f4cafe77c035a3c01584e627c3ec2179a37d45. 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/KRMIM2207920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7859e62658ed315d016ad3812494b3ec7f1f291921a7ecd93c3cf8da921c8b5. 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/KRMIM2207921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58928bfda048a44d89d94262a04d41f069f1e94687cafc8a29b42d44429ee117. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/KRMIM2207923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56219971b703d1094770d98732127354bcea2e19461d54bc26b0249cc293c5ff. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/KSA012308920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ad747850d8a61a330dcd2dd7e66e20575b32086bdfd1a551f8d142ab7aaeb3. 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/KSA012320522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822bda0e930ba9f5384451043e4171ac348b78f656322b702ec6b911d4ac65c4. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/KSA012320523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2bd267e8838ac378e5217160a38ba40e69aabe0796d8379835b5ecd0f062a0. 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/KSA012364782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21dcfce47d81dcd62a7125b4b53b93afb545d3eeb992de85ef69233200db76b6. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/KSA012375621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593a4466fbc7918b3ece79ef065e858c84b876ac070c40f8ea6a6eea96a8819a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/KSA012373448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x459b3c50880907915c7c9cb0a52728c18e717a38c4ba3ecf21e81154dd7d5f4c. 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/KSA012375625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2bd267e8838ac378e5217160a38ba40e69aabe0796d8379835b5ecd0f062a0. 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/KSA012364782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2c4e85071e5edade3ecd7462d4e416022beffc63af2357a55c37f17c9e07ae. 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/KSA012375626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36dd8099d3622d23d9e542f0a7c22517d53e578d3b095478bca72a90d4b87a4b. 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/KSA012396085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f842858544be715e3a07437a457f8dfb0cfaaecc2170196c28daf56a3b25197. 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/KSA012399798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36dd8099d3622d23d9e542f0a7c22517d53e578d3b095478bca72a90d4b87a4b. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/KSA012396085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd11ccb9918b7a0ff36e125a9a33c142e5f8306eb83b90c96cdee3f86bc63c803. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/KSA012404291.