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 0x8b0b6a83c55dfdd2b217dfaced46fe2c8206bb0873b5536526b2fee8ef2fa52d. 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/e24e8b5d-e90a-4dce-8170-c3da4b57e47f.json and https://artists.proofprofile.net/proofs/artist/e24e8b5d-e90a-4dce-8170-c3da4b57e47f.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 0x6a0423d2d130106f10c0f72b9859615713d13f85296e755ee166d0f29f94de6e. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/DEEC31900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b1fedb94b1c284ec87cc045794eb010685255b43324fbb0bf41e1d7a3284b1. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DECY51902611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6eea5047c4941934c6aaebc30401f81d6a5283f8e89e2fa43976eef175e64b. 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/DEY472070120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd0f48bbafcef4162182cd8aa2630f82ffdf4b27c8fe5666aae0c321c194df3. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DEXO42235583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cac6c412762d6f4d417213139ab71dad70b0759e00eb83b5651ec538ced4a88. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/SE6HN2416670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9707e26edc5b16ca642079bb09d98b51b7ac419dbbdc88d2a6936df20b05e39c. 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/DEKA51100569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb337bbff42a943e6de8e3ebb5633eebaf90972c1ddaf9d964e60fd6a1acfab8. 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/DEKA51100570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2e93abd86c279faa6741e80f4e06bdcbadb61775d6035eb516001a43a4b91c. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/DEKA51100571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3319364e87eee7623f0a1f23f319fa8c38e3390f52171ac13f5699a0e8759383. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/DEKA51100572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ffdfb5256f8f8d140f6ba28e735b5bc2b397cbfa86713c10e32d5c2cbe0f91. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DEKA51100573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c2ab11e105c6aa4ba5d3de256a9ac4be5e3c4e2fd33390a605ef2b0c9878e7. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/DEKA51100574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84eb9a3abe0b916c634773d60c7014dfe8b7e5df991ea186a2b09b349d456100. 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/DEKA51100577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9318bb911525268ab971f9b624be6cb536ce6cd0967d0dad7ab6d9fc8dcd1cdd. 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/DEEC31810144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c81b014cfdb5dd75dbb395e09bbf76ac9536f706fdc2b62900f4b55262cba3. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DETB31727185.