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 0xef1bb42ad83a99272051074ba0a1a24d755ac46a2deab19620e7c2f6ba1c2b5e. 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/a593da0b-2849-419e-966f-5ade6d80ed46.json and https://artists.proofprofile.net/proofs/artist/a593da0b-2849-419e-966f-5ade6d80ed46.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 0x05cf822235e40d0cdaa84a1769db18ca6b74996d514dc659db74098a0020fbc4. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZHN32053012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc5d58e6d6e36c6a790356a5c81865397b5554bab5e0110ebc175fd62c8376c. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USHM22142206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55ca62fe1e35d835d0f49d7643be6cf4960d024867d94e23cf3478f124f7f9f. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZHN32176256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1223cdd5d06e41bf08cac3212c92c0fe8d924378d3db80784b49d8a96cb1b95d. 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/QZMEM2029371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3fb63dabc298eec02a858cbd78821147dd5f59e60a9b2f53caef1e55bf797d. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USHM22142209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0b422c39f891929e92b85e7d07a9d36e1efb69614593e0e463022f6ab79c36. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZHN52173438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96408f2237962ec2952da6bb54f9817f35cdc2b4271b83f7afb1f9a2909c96f. 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/GBRKQ2129039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6243ec3bfc5a6917c32994d4d99829241d3b0c28553ae1a764d513b473b2226. 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/QZ5FN2283134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e465a1b15a3b6031c767c4b095b37ade9c5439c4c89e08995250502405df480. 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/GBRKQ2215977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6243ec3bfc5a6917c32994d4d99829241d3b0c28553ae1a764d513b473b2226. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ5FN2283134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1bc47981ce46b8739a0189343a8268500f47a7ef055924c462cd4d7922253e9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRKQ2261495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e465a1b15a3b6031c767c4b095b37ade9c5439c4c89e08995250502405df480. 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/GBRKQ2215977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15da8c3de78684905be3753cc7c7ace991d32f3f17038fae43a6a4b3dbecdd5. 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/GBRKQ2261497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028bb62f21da675a95a6b311c79f614b7fbbfc296d543ba818c8bcf1b93e0965. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZWDD2484479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96408f2237962ec2952da6bb54f9817f35cdc2b4271b83f7afb1f9a2909c96f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBRKQ2129039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc2b14bc6088da265e3234d678536cafd5fbdf558dbb8d0f1ba1e7eecd50dae. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6Q2154357.