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 0x63cc933e70a3124b62446618f3cd856d5136a5f17bb8dd6d1ed53e617e6820da. 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/19873c22-bf64-4b4a-94cc-c058f7c49fd5.json and https://artists.proofprofile.net/proofs/artist/19873c22-bf64-4b4a-94cc-c058f7c49fd5.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 0x7ee7e6163ee763367746c8eed8e853857be86ee03821da5aaffe5f1b9c00f327. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/CH6542138581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c55ace4414fd56f78d4c456ece3fed64866c2af9d0ac1afa3a5b78fd9f6b5cc. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/CH6542138584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3989e9a77588d4917a8dd98cebc006acc59e740d07b74f84aecda748ead905bf. 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/CH6542138585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1094c29172a3dcbcfefe3eb36aaa3fe6fd670859b9ecd27ea1a1370de3495d52. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/CH6542138587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a80f622ea989a7a47b1fdb1135a21da8c89492bf571306d8cf65fd40668b44f. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CH6542138566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ec686dbb46e24574f546c2f67d19e66f74c466c5e6ef337ea8128d2e62e748. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/CH6542138567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b1dd24a0557ea8b2b3a1c085112e250a8178445545bbe3e41d6a7748c91bf6. 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/CH6542138569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b4787f3a87b72c21e7f6aff44016023bd3449d0bdca79bba3cc5a7517228ba. 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/CH6542138570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a1f60c84d489d08bb58c63683712d0aa3b6c6c0ef2e1b38d9737b03247da96. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FRY189802911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda11c359ddccbd4597c697df5d5bfd26c82c5ef794d14cf8082460b6c57daca4. 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/FRY189802912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ae838ff333fcc2e1ad15de96e7c8b61b4b6a52d5d30ac623a92c61b6c64957. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/FRY189802914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bc408c4bfc1793a2e703baf5f271cb2ff8f612bdd18fa99b7ac151dc08dd4b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/FRY189802918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a20dffe7be3ed51a35735c4693203b12af4cffa174ebf8cbd4ebd731b5a2d45. 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/CH6542135668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bcd0cd99f80c10d6492b366ead09bde2bfe01e19b034ea38f17b11a92084fc. 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/CH6542135669.