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 0x15558066635eaced27ad63393fa3ecfe91e79f46bcd572f46429f009471d1be4. 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/b9b9202e-fcfc-4e35-ae5d-3b6057309835.json and https://artists.proofprofile.net/proofs/artist/b9b9202e-fcfc-4e35-ae5d-3b6057309835.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 0x7677a13d0b39038900c80e1a68267ee80bc30a0fe8d7710b263981fe3ab48a9b. 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/FRIDO2413378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a31902523d39fd60db5f64080e8d44696a1bcb06bcf452e3a3b936b56fe1872. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FRIDO2413038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63381b9137c096b4128a56f1337b428000a4db55eda1e806626ab7bfc1872ee6. 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/FRIDO2312834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405fd46b713c113403c77d9d92479beef6ab44ab754a558f66d42f37f4f56326. 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/FRIDO2313174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385db1b3897b1e5860b26afd72768eafc34cc6b66988ee1e97819065e563b210. 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/FRIDO2313892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405fd46b713c113403c77d9d92479beef6ab44ab754a558f66d42f37f4f56326. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FRIDO2313174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6e3b05a1bac9625f9acc0239e1dd26cfbc0ea59d2d6def7973fc38efef32fa. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBKQU2316047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ee4460e1adee302c5be82ce4d62546596827399758c34d251b59f7a8dd7c35. 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/GBKQU2300755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2346aa458e63254dbd86c162f60236de21c26a4a75150095fbb72b25aa5018. 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/GBKQU2316048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120dbdb92738aa15aad2e853adffba5c60db39d3ee5358e5e2536d5740f1f5e5. 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/GBKQU2297673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120dbdb92738aa15aad2e853adffba5c60db39d3ee5358e5e2536d5740f1f5e5. 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/GBKQU2297673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965988741431cc122dad402c3871e292c012be2c9a9841ca4efcd391876f1120. 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/NLC7F2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e7243a877362d8e1011ff892258b1c049d0eb094402df6771da5ef065ea532. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/NLC7F2100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e7243a877362d8e1011ff892258b1c049d0eb094402df6771da5ef065ea532. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NLC7F2100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e88177a2d4156e424f3f929d8b2eb41b22eb317ed9917bddf13bb41ad39d769. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLC7F2000104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7305f4a264c61f4e747b71435bf1ccd166f5a51da34e22e53050ecb67a3230d. 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/DEBW22000177.