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 0xbb869973b20bed0510851fa5b4d61db0e828897441e2b3e753d11055c13a81f4. 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/116a8534-9ef1-4c59-b293-cb3b3b10c5ab.json and https://artists.proofprofile.net/proofs/artist/116a8534-9ef1-4c59-b293-cb3b3b10c5ab.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 0x2dec5c386d9f8bd4d66dcfa7f21ccf4bc38046cb62da9de14b6b4c00e37340fa. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US3DF2411608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd342d28e6e68783547d45f7f18227fb75bade0969baf31a5c49368eece2b8e24. 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/US3DF2453376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630e6bbf5cd18e5b58a144cec69206d70bb227e9d7b3dbb7e92349a134a6e686. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/US3DF2474315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3a1391fe448897dcc998d923d4db7e40100c158f116ab14d6d3bd08f8de4a0. 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/USANG2480910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59422c8722461c7f1c341c8fabc6681ceee352929c8b8e0ed97ea8097245065. 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/USANG2480857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x548c9c46ee75c0760bcfee30f18420e4594a1583bbf359b105edaa8b0f6258d4. 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/USANG2482003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22deaa1ec7a299ccc5ece9c577808d221cd18f9d1296ae07f1480b5ef727d416. 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/USANG2484669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e0af48377c2ffb55d8273b2f29b5bc0e1d11353aba1848ef08139c6f2f23dc. 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/USANG2494414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84bed6639a0a90f7b338e60bc1230c56ed2adf64ee5dc3a0f2a9f1e4619e484. 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/USANG2494415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553a1922a9069c273522901e21cc91db64eede4123a42d9d1c01218fd67951d7. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/USANG2499842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72936bdc18b5696aef01164857f64312acee12564b347c98313643ea40094742. 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/QM3DF2401572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddba063530706f853a4a6876b9d924668bce015a7c5f892aee8971c85a0f8dd2. 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/QM3DF2401573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00daeea0d771ef5b2fc128cd0f4d1936566c7a912a018f09e4e405fbb5df7dac. 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/QM3DF2407357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd753b65abfb4e23ca74584c418fe7134b5e2c081863e2521044a4c77f3b5ae7. 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/US3DF2450496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c2fcc8fcef942f89d1919bc43ab4d831d18d2bd9a183621974f3a107429482. 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/QM3DF2408542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bff662d993905094bc38d3c4f8e19c2854babb9f1b96416efe8de1571bc3329. 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/QM3DF2417655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9fefa42697b8790bde51d2d19095f9163c9b4198c9a67d896922687901d8aa5. 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/US3DF2517332.