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 0x9641482ae63ecca8e3cd7de66be7e0b43452f12b9fc3c601eee68f39591a1e5c. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23ae8157-e401-4a1e-be98-97f0060cba96.json and https://artists.proofprofile.net/proofs/artist/23ae8157-e401-4a1e-be98-97f0060cba96.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 0xf6354aa3423fa72f41bf967eea7e11193d2d0bd773afd86c90d33348b68eb09a. 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/SE6XW2231863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf599d95b3d90586e04bc05b739998f905e6002f442057038f0866850426429. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/SE6XW2231868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf710d1fb87e7b3e1ba9c05b5ff89ddf4586183f4e65cfe95a5ac03815290b687. 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/SE6XW2231871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776e5e3a0296a16d161b174b22d8b3f2d1c34a3bfa10afa5ae58235d18c79434. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/SE6XW2231872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66c4fc14fe5d319cf5ca0c050070e91c0b5e9960e7eb39f7606e2bb6431fb0c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SE6SA2222757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11734e44710a1cdb5ec022c3a9b02ea52250c37dc70ab0936c14118e95774277. 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/SE6SA2222751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb9bd0515ee606e3df9101d1078ecfda70f5c15f8654b37f8c6be0c5ffcbbe2. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/SE6XW2102168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6160c5bef6e4ab7c8e80ec69679a59398703d44e4aaebf278c1b544086af0271. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE6TI2069998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82fd2aabf6750b52d8cbaa5f658dea4964eea9bef1442da0db67db6cef82d63d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE6I32089623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1ff42de40063b991c3528ccbf6168bb6945f24e19f7afc153cdaa2e100004e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/SE6A92059418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8abfbf4c6d956e1d6b1603af665355279e0977504823c322a843176ac199af0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SE6A92059329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82287b5755bc90ba98985649c19a0af73240cff47151aa1b097cc0b7963ff82. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/SE6A92059319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53a5e65c110888e3bf1ac00e3ae28f1aee5776e28c94e5024da7e4e20c08676. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/SE5BU1955304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c07b9eb2d14c19dce0575aafda03878514126049aad99509c368c28bbbae6f5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBRKQ2058422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914c78edbae51c98fbe5e4060e29b0670aa2da5638dc1c561ec8aa8cfefcfccf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBWUL1908532.