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 0x6b60c29405de2be99c7db62d322fa4c70ee12933cbd254df0d6636477ec27153. 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/d49428d7-c851-4a6f-96f4-1b2bca0fb469.json and https://artists.proofprofile.net/proofs/artist/d49428d7-c851-4a6f-96f4-1b2bca0fb469.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 0xd2d8fd66e81ba3aec084bcfb4c927d66c8e6b8748c972877fd516c3e27e19877. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWS2149023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a1e8c15440df897ad15a38ef02ec923b55bcfcef8da072612d781d46dba257. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/ITE1X2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836c77e73e6dbb977a241e4fbb4aaa79c3d33e6586af6f5e7623812998f96348. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/ITE1X2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997337e1cd2a8cffbea6cf8212a666c0d9c0d08ad19c0c95110548727bd3c223. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/ITE1X2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc681762bf1d9afc4af6a7e87f075663fe300fcf089bcc0cf78adf0c1de3f4f20. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/ITOII2300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ddbe9ca83ddac28ebff8eb8cd292a55e46c81c2c64fbb3bfa33034e579475f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ITOII2300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc861fa6defd84c1bdb1928c3ee3889937fbe7671b58493d1043ce624f5085cdd. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/ITOII2300034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610787b7d1b0f8903be67fa264d320862b942f31c6210962d25f60c066f4ce7b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/ITOII2300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f94b7ea605902bb922d6686deac4ccd8a3539add1cd7dfa1b376ff3c145d0aa. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMBZ92568665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cf85ea0883a681a584ceda5a340b8751327e95db0e6c121a42b368c33d584a2. 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/QZWFK2390811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f34cb2dad812e6d1665f1d3aedb35668ec3051d27e66c70f5954d5d36e7bdbc. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZHNC2348996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f34cb2dad812e6d1665f1d3aedb35668ec3051d27e66c70f5954d5d36e7bdbc. 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/QZHNC2348996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795982d2a7c5a6eda0beda7d051b9d109600f390e7f67fcc9b172c6296e70889. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZFYZ2456772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f9d332efc9950e957ab14f144845982802bcc8dc6e594eadf74f72d4b54cf1. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZK6L2334836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58bc52078827bccbc7ec92a3d4eaff788f44c465f3ff62a358b9ef70938c533. 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/QZMEN2357656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8bc243661d357ea4d9d0f0ff4c1d94c85fe9eec860f3c570eca9dc2e4a3e1f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM42K2353049.