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 0x6407ba30492847ad2d227119fbd20bfbf0fc9b1372a5e19d42f86b4b3e63edf9. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbb51b5d-0bdc-46ef-8030-d3ea40285f6e.json and https://artists.proofprofile.net/proofs/artist/fbb51b5d-0bdc-46ef-8030-d3ea40285f6e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Positive (Music for Sextet and String Quartet)
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 0x7b5afa87b3ec6664b4f43d3b8f6459a529e0d7a2f7af940babdff5ef47d21e1a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USCGH2157460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b1e06e967965a6d1b1d3f5f7b14be26a63a63db6e1f6d81749659ca480a55b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USY242473118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb8a4d93142d863bd3167944fbe1ab702fc58f2098be849bf772995921f0453. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USY242473119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630e6fbc80acc1fc63ebc7756849cde3f128b5bbbb02e7117ef2b557d22ff94b. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USY242473120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdeff0f97c7e7d43ca314f434dcff30d1d394d3e9f51cc788268674919855331. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USY242473122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15993eb4f0f694fe0fdbea1b72f1711129a6854a01f540c99dadeb418b706e01. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAFY2112877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0f5d1a5c03b2d1d5f7692682736ec72e0129df2b10d8a424b01faee2f0b2ea. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAFY2112884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622030ceeffee56a3e4d421946ffaf6aa3694e063d917ca0ed937f52a326f768. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCAFY2112893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4fb1f683efb2ff60822815c42d6d57c66288a7f8b7f6c8c027bfb42447ca5f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCAFY2112895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x131fc1989b16e33a9c75b3de6bbfc74822c6ce5d2b1eefc9641f04f363e453db. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCAFY2112905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab28393f398ba285669180fb6c3ee589c94fd13ea14a9ea93607dbf7b1520e7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAFY2112907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e1c35108d26f175ee6e48762b1188c15044c20bc70361ae2a06a9e60a2967a8. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAFY2112909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ee626898aac5248321ef43d5b3660a1859b7dc320c1d5f25e15c916ba44541. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TCAFY2112922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2396a3b01cccf61e8befccff4e122a459ef8b5ef45ccf210253ba0e37f755c3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAFY2112925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b90bc0682408e44a29428dbe2524a9d587cc215cb1c934a9a67a458692f875a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBSMU6105011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684c5a128154fc892fe86581c6e180c5a065b82155894c58305f8a1e6ce09b8c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBSMU6105062.