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 0xda7069fdefa027aa3ce9fe2bf3718348c1a93ed34bb9e5ca0714dad707c716c1. 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/932df7e5-f313-43b7-a961-f51d320d6f41.json and https://artists.proofprofile.net/proofs/artist/932df7e5-f313-43b7-a961-f51d320d6f41.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 0xea1c95a6290ba08ea59377d9536a81759ae9e421cab0982da213133cc8cd2831. 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/QM3DF2143781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5c46ab2ad07e6965417958accbdbf2fca2c82fbf3d737f6fab4fc107687c86. 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/US3DF2202653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba32560a48b98daae9a9bb41515829d0546db1fb6c1764bcb9d5ec2e2c835f0. 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/US3DF2233780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd91b618432b49c96f0922571b87316f6e8219d9d443965b4716f228f2c4043. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USANG2292386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe961a312168eb49bdd02291bb4b69f3662c46ece0e6654401d4ad2832067ce67. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QM3DF2207809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b38dd5be2ecccac9dfb2feefa965a57b6cee4ccadd43f8faceee3499e4d1cbe. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GX38U2336761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbee39abb85c7db5afa0111092c468977b1f956098c7f2f99ceb12981fc6058e. 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/NL4WT2300175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cf898cf294b7005c4d83b61f5aa2f0723cd2470ab1e64e7214d9bb552ea83ed. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/CA5KR2360754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccf82415ce9f9046e279ede449e25848a33abc434a54d089ca7d145b4afb192. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QMANG2218408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30932928a531981e8b52efb27385e9a8662cf2bf81f925202052f0d52f417a22. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/CA5KR2430272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587374c6daaa1c9577b4d7a72d98d10672a29e876ebfe63054580ef8cab00782. 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/CA5KR2430273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80c4277454d3085479be9e04195b9bc25ea459c5c881e87ed49f451541e91b9. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/GX8LD2468908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096fab6f6ae4b90b5065e58abfe03596ab41135ae8c6a478e0f8c2b7d91e7cf6. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/US3DF2447054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68f80d0c4fcf2a5aa3b4ef7fe7d989b9714f45b86507459c5031cc6a5da6b9a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USANG2214912.