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 0x4f18ff202385fcf0d21f08ead52b3c275bb45ef0b19b83bdc5eb6a8b0b46d40c. 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/13f42848-1e79-496e-a130-698592e04915.json and https://artists.proofprofile.net/proofs/artist/13f42848-1e79-496e-a130-698592e04915.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 0x919b25184d9fb209f2e392dd2790a45033ffdd8afbe0037f1a56f492b8597683. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZTB92485943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43aaaabe882cc0138be5b1a47e0d284e8bd9d1f5fbd334159c401ed719cef496. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZTB32471075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2d474f81ef0cee3d941dcf0ff744c19388f5236be65da843b3644c8070e607. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZK6F2436378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0336aaefc40aa8dfaa766e789abee5669653a923a967586780e10b584c49003e. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZZ7L2411362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9ca79b154e07d741f4d25833651a288f6064e5b7b81d6a7df007036150afbd. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZTB32471079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91dfd0ddb46029645f2370a6b2bf0fc610794f3a9e4a24ac0a874146d7d38d2a. 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/QZFZ42570047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3628fc1bdc6d998688e3f9bf266ec3ed87530db4e964fd607e613f7f48f7f84c. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZDA62597110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5c826e9d18d056247dfc18c4295959d689027b676da08b518b743d42fba2b9. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZFZ42572194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43aaaabe882cc0138be5b1a47e0d284e8bd9d1f5fbd334159c401ed719cef496. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZTB32471075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9722b9adbf1131bc96ebb7dc1483a85605d0fea721d8c5e72dadcd66a5ccef9d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTB32471076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d44a70c37c9599f59b993f9d7d24562fe2aa7385bfe10a29ffb646c5be1660b. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZHN62569552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2d474f81ef0cee3d941dcf0ff744c19388f5236be65da843b3644c8070e607. 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/QZK6F2436378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796c5c3417bbe6b34f786b47e6d9fab57ff0fa19a27b35e31554ce382ebcc596. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZHN62569553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3826e010c9f810125805592f9d1b6d9f39fe8b71670cc82e857720b602194a99. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZHN62569554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c47af21cf1c7b00cac53e9c09149914b0f520fecae9a00dacbc1c33aec540c. 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/QZWFR2557607.