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 0x08e18a7c7d917f5c5e95785f494cf6178025bcd53b9a7f5481c73daee415dfb8. 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/10ab6d9f-784a-40ba-9b51-f83b9f56b84f.json and https://artists.proofprofile.net/proofs/artist/10ab6d9f-784a-40ba-9b51-f83b9f56b84f.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 0x0103eef52e78ce27207cec9099affab880404c1f582788bb86692756b4f8ac3b. 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/QZHPJ2253473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae13a4bca523554b02f61ff18d87a02b5d03cb0d1415ab5424ffa75ab03c509. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZFZ42357194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d4a21d35966d4343af8469021b9884ffcbfe2d5efe96adb806b9f287b9a7e6. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHN52337590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b4bbb6d380620b5f62bf7f6a032b6bd9b7e74bd7e5a9f8473149a7d75d88be. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN92357970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68aa10437dc6d18337cc759e455f94aadae037dc9622353a9c524fe918d27f57. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZTAU2339717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09295fdd80f2a7dd4c1fad779ff13105838698d70543ce806c33f9ca863e4cfb. 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/QZFZ62423456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384862f2fd243f070bea16e2ed43d3dc9f683e73beefb5e72cec9881b4ba9361. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QM8DG2481188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536b6a370db39cb1c0ecf9ff121b7a851017369801c90b1e06caf54e845a58bf. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZK6J2448657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe18f9a05aa18c403bb98f6076ef534a12bd0e88cae130dcd1bce5d51943ef89. 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/QZK6P2556999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d5437e31ea30fb9549dcdf689610b068f5ef4aff52fdbe3b54fce1ce24b150. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB62561089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb1950a90ab2498c802172ec355a3ee6325596a9b8cffd746764be63f37104a. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZWFG2584110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8c9e31e7dbdb2c21e2ac4cf5c3bf8705f74e8ff468cd3e41598d4559ff294d. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZWFG2584111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598932732cf8b832492fde0ba8a578a4ca3ca909b75504099456e1e6e28e7740. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFG2584112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0674aa448573d8bebddf7bf748dafaeb9db88cf224db87502f68d34ab101c72a. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZWFG2584113.