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 0xa720058b900468b81e4dff44f5a73a01ca15d41cb7dab8d9a05294aa8a48a835. 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/f4549650-76f0-452d-9d58-63ecf70ec02f.json and https://artists.proofprofile.net/proofs/artist/f4549650-76f0-452d-9d58-63ecf70ec02f.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 0xf011b2f8faeb90b592207350d8453186790b7b54b5d46a4bd21af566384eaeee. 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/FR96X2126302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2ea8acfd1e4a7e8e22f00ba394915ae712512b268d6ecc3f85a46b357ce715. 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/FR96X2126304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ffb0542b8ec1d59c367a1090831c738f58da1ad7278256ae9d1b129927c89a9. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/FR96X2271768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd98ea11b9c2dde5f2ed2277183636ebe45aa3f057bf76a0ba5f4be31b59774. 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/DGA052290630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a288233428be967c6c322aac95d1704d4db789e3b3e98cc3914a52507df7109. 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/DGA072242575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e33d395351cc77152bce2e7e8802c38197c1715d29978ba3ae22f817548cadd. Chain 2 (Bitcoin): anchored in block 957726 (2026-07-12T16:04:28Z), 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/FR10S2312194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30fcbac3ba46f36ebff04db860b4763367d7e507f4b8e27aec54cc8ba090fb6. 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/FR2X42377254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd21ffa9b62cd60f517d2cf383629209439fce053e593cead4c3b6c501aa59f. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/FRX872380968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4407c9dc18a95b9238ebcae3ffc5cfd63f921b62f796a8ab3c7873cefffe43f5. Chain 2 (Bitcoin): anchored in block 957726 (2026-07-12T16:04:28Z), 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/DGA072365435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6c7123e85707b2b1b0051afa730e3875a17f53e59b6c263ff88ef329209c2c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DGA0H2325711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4f610e3efdc1d5fb1fc1aa7f420f0a0309dc842a7c5361ebdff6ce66edfe9f0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA0L2391504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a5a7c5bf742cfa2f0cdf3d5177c94a29a21c20fec9d8791e76714ea0fab63f. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/FR96X2437547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce7b73d4c55ff36e37c53a90aff1860c5717dace55b195fa604143c4cbb6af6. 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/FRX202460759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30ae86f1ad89776617600f0de41edc68e263aac8090c0ca1d18be5cdb3c624c. 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/FRX282416494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae1344d6f98d45ecb02a53981d61a771021318cf6f2774c62e9f6e116e8aecc. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/DGA0Q2453801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7cd236c0bf4507d77c1c3d03dffeca8ddb6e75bc9ddd24e85159c3b9498767. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DGA0R2470872.