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 0xf0cc25ce4c18603a2e1dfd69e69b1e2da34d571141c4464db7dcb0a3f9d30cc2. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bbb590cb-e81a-42b7-8ff1-1f32ac314f0c.json and https://artists.proofprofile.net/proofs/artist/bbb590cb-e81a-42b7-8ff1-1f32ac314f0c.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 0x61426b5f2a3f166de0d399e1aebfb3cb33471c8128d54a8ea45b5a4d42b3aed1. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZNWW2495094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd07cacf2e8dc9119eac2093084ab4a15e8b78c0c61805ac17cc04a50fc3d02. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZFYZ2522505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317d757bc9d70fa474b4ecfdeec11bed3d12c1843992772c9baddd616513d234. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZES92530988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d3408c6d0ef5f3d7f75878a62fc03a589a6924da2429f87ef1ff557732d19d. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZTAU2549748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6527c207260588861bf14190ab0c2941596643f3afff93b9515885c4636d5f00. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZTAW2557055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x388d652211d8d6e473cf29fa2f2ddf7beb9ead845c3a33ded7cf8e2315c2e67a. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/QZTB52507775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa770eb0d5944323253e1eb6eac462806cd4e8d142d2a610a10abe492d6dcde4a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZTB72506671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcddba2795d2bce43ee9c4ee3575e9a4876944cd07e9972926cc348eb560fb2b. 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/QZTBD2540526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e808b6e4f43e21c6325b6d424ccd6a38d611b8079c957aa3190884f7c1a606. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZWFS2543893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e05f2b1fcda24923b0f8e067a2f3f97776545780553768df0dedc84bc38666. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWFS2543894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd666fbee0a93be406889859a5a8bc3df8cf5d95cecc8756650117896690357f6. 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/QZWFS2543895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318a9fe94fdd789b2264fe62c777b4b788e25956d77d97d4325b34073f7c7ae7. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ7R2504274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca1ea43bd82a5d0dc7e1ae99716820d18dce5a61349912f56bfa7261187bf0f. 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/QT3FA2568464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1002efca245a40e7d2142c05b8c2e0cec42e3e84a5d72032f7135c1a64bc88d. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:47:59Z), 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/QT3FA2568465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b6d0e30bcab74fad2b44d0147b8ff1fedc96a4803e6a2623b19e726f954e10. 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/QT3FA2568466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1cb36b81b2ccb6f0d3cca49efca56f273b13a1a13873fe6d597f9a13f085901. 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/QT6EE2512349.