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 0xe256bb793dcc7c3c39604507c96efb41f2ccbbba68ba1a0d996528a4caa194c3. 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/2896d35e-b173-4bc6-88be-5f4088836bad.json and https://artists.proofprofile.net/proofs/artist/2896d35e-b173-4bc6-88be-5f4088836bad.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 0xfb677288d29843c1a68bf27661fc8b2746a7ba4b0184519720eec671883f5664. 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/QZDA52123429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92785aa48526c09c9d8a27d762307d76e841edace9e11b07af308ea00ce54ec6. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T14:07:08Z), 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/QZDA52123435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda96165b647fafcf1c5279e709c165af2c7c2dc8f740f9d46636e4d48acd1520. Chain 2 (Bitcoin): anchored in block 957558 (2026-07-11T11:36:38Z), 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/GBSMU7866378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7063ac47d5f04be514b5d474faa9e8d9f40a62e546691533c250cd042502e7be. 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/GBSMU7866380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1078dbcbd1477b27ae234b330ce8064b8f0372cda7609f1048a37587ee2738df. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/GBSMU7866381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37be7c2498c7af863191a7c5f36d9ce16c448bc0a7669959a440367002e4db31. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/GBSMU7866384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87bb3010e87b7b8809595be4c8fcf3f12b3efa67b0263475aeb7a7d7c8c6346c. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GBSMU7866385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fcad29de883d578e9a38e0e3e5a7c4d32d6c3aba703fa7f486ed008f4542da8. 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/QZDA52180654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dca1cb3dec8c51ad66b4fc6e05f6dff94c4ba0fcbba380d6bca2dc8319bb64. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZFZ72193428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9b494fe1e3126ff6c29c9dace9844bb1faa9e4fded2a51198cb286db4c34d6. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZFZ72193429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e5b60f30be8502e4b1be80a8a92cd5a4d9ccd609a8cd69aa9bcf986303312e. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZFZ72193439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb97e1f9dc9e54daae12332f3086a5d23fd7a677e1d324db8d1d354f8a9d416aa. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZFZ72193441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf917782a68440258161218eabcbb5cd9940e389a4d482cf3918b555d6f9bb510. 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/QZHNB2192233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af078595fc7d423ae10dff0b946c9103138d3b8b064bea550ba5b847971d70d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZNWW2326959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80df42c9ee0c6722eb8beab613fbd5fcc354e64523494254e42b6a199629ab78. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZES92595681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7670c9dbe1e58bc2ec5edd4c222e3ccdfb626e8ff500aa68ac3faca1734e5f5c. 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/QZHNA2571428.