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 0x84941a4e4ff05f74f59543e086b8d26da314310225193abe98f7a31095f466e3. 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/d81e9e33-d0aa-4951-ae50-336a31441813.json and https://artists.proofprofile.net/proofs/artist/d81e9e33-d0aa-4951-ae50-336a31441813.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 0x9f102f60626c980cbf301d3ed02d4089866b13698b095510043482edb52447eb. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/CNZ331800123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3f0f6aff19580d35a1af0cdc699568d6464975581dacb81d42d1366ed93f2b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX202048910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f185b89c09a6b820703e4edace7dd18422bb0ee1f8a9e30b92d77c527c1529. 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/FRX202048911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c949eb04ad91654629acdc8e2e63e2aac4e404b04c1fb53a362999687cb7faa. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/FRX202042948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37b028373ac63f0ceed3b649ab92014d6cd88fc95284e544585d4e5ee7ab551. 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/FRX202042949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1d6ac253db6e2ba45eb0198da638488c023d2b7950b30664977f0e1871ca50. 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/FRX202046101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbd3a06a6758d3bbd3af465f5a425e22773ff5a30313d9a48c07540640031eb. 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/FRX202046102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28a190823167aa9d77ec13ac494bbe67016a0bd9d9d87d3a0c52bfd8e3a83b0. 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/FRX202048913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd784b61c4eefd1edb7ddb3791e6df8baef7ff91d1b0c582c503ee3fb0e73b1e. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/FRX202048914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c13c93fc5f10a54770e6a342802163b6347221c42f358686fba0e1bd185d94e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX202050669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3432bdae916ed74e31b5aed778b635f6058ed12f7dfc5f57d8cc9f84399bbc6c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FRX202050670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32b78249401a691f4796db1763123619ae037e6ea11d3b0545fd923261d7e11. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FRX202055876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee79df15a3892432d585283aa1163fb28f6e0f687559842b1138c47891b5e06b. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/HKD012384375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0c38abd0924fe70d7a4fc629df6f3dce169e38630c298f5f3e69b3a2230fc4. 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/HKD012391387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca989bae3c88f56f301a978cdffbff88f9a1f19076e4d551c0f90712fb4636e. 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/DGA082294751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7efd2de363e630a26980bb2e85dc3b9efb1f8f9ee6c5f5932d493bbfd7af498. 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/DGA0S2427173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0628ecf5b6f4603d389ab131aded584129d1dc2c733c1bfff56793125ada5319. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/HKG732513006.