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 0x74036b07c803300c3126c88ac96c8d72807ca9375e10aba8a2edf76703b5b936. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f9a4c12a-7ab6-46ad-9a10-eafe879029e6.json and https://artists.proofprofile.net/proofs/artist/f9a4c12a-7ab6-46ad-9a10-eafe879029e6.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 0xe1cceaa1dde748ae9a9271f1e14e3c0cf2bad2fc09e28ecdc1e3b47ee0e5d790. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/TCAIK2427032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c80a6cbef15a1f175b06c5d9e404dabaa949a1c01ce80f59430a8cd375879c5. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCAIN2426423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6907d3ca27456aa325e723bdccf9030ca90c22cb0759ab5c1e2b2c499ac64288. 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/TCAIM2426430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd613f7a3c33f6ad3793b4de9bddcddb4a45150a00b20e525e0542dc874880da0. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/TCAII2446964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc00fa1831f51001291acd0fc8fa355e5a110cad1950157c09088e1d0c33ff05. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/TCAIN2426444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7f6258a625133ade4879051b2e0d56a0c495bf71ef99a6080c30b09aee09ed. 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/TCAIM2426450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f10103c64aa191439ff8b592a4adbb3f3f0bcf98b906fbedb37c45593b86d1. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/TCAIN2426453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9920872e5804414984b96af83e2ef555b6b02266e75cf530202583fbc5b04f82. 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/TCAIN2426462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff5a89c2355c209055672caf4db7c75b2eebb6442c0c168c39a6fe82663f632. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/TCAIM2426465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393d59e1c8af52a9955fe5985183e679c2e43f61f217b4667c4ef992a08ec263. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/TCAIM2426470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b3b6fce636b8ed848c8bcdf720ac072f9e120bb4ed7aff2d763b6697b3f71d. 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/TCAIN2426475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35038b1a0a27c872c1e3c0a4107328962533ee2a39265d6b0a7c513f8bfca12. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAJO2597224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f1a917ff0f0ae3669a883909e24fcfc32f46bc03934cf3140d2a6c66ce990f. 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/TCAJO2597272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35038b1a0a27c872c1e3c0a4107328962533ee2a39265d6b0a7c513f8bfca12. 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/TCAJO2597224.