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 0xc341a547f6c726771d019e047324ed5fb2569f0e6342848010d27417317cd072. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/48a9e518-4b5a-479c-a5c0-67813626439d.json and https://artists.proofprofile.net/proofs/artist/48a9e518-4b5a-479c-a5c0-67813626439d.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 0xde70a35f1f0f15fcc539abf61d3bdfcbc726719017395b1d16f35d3181ab9cb5. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZZ8B2374451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d1088793be4e0f147e2960a64d2af9b18bfd80834e786b5a5df02b8bdd6ce0. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZZ8B2374584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5a88648a0b5db1041083a2af060c85e6f53cabd570b60e24d7445aa56f86f7. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/USLZJ2417493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x146c511e010ee8ffed18811737ab3e564e3fc32f59a223b8c92f67fc6c7bbc0f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USLZJ2417495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b507f9b703b5bf41d24311e2228ec14baeffa77218b413150abddc3af085d2. 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/GBRKQ2449336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc205ebc1c57e8f3b5928ecba2ec2213090a29f9e7c1fbe88d5b7d388486e9555. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/GBRKQ2449338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72da78c9f7f837058e148084518e2e006e5470cca7b47e577161c4e5b5561a4a. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/GBRKQ2449341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c1032ca409d039aff799c62da510e82e45323010853caf2c69a20eef6c9b79. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/GBRKQ2449342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14086ca35bc268d77d6eec3630a5374dc5560208922387a3e7c0becb73dcb44e. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/GBRKQ2449343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0112abb6bdb1316c00a3ee5ea7dca2d56340962e2fbc19ab89868ff682475f8. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/GBRKQ2449346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a99be8a2957f45db7b617975e875f30c3fb87c47b4295d798755b76f424479. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/GBWUL2465865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa4d06dfed55e647617a6b507d0d4f0cf912854ac90165a2bdcc4ecf27a446f. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZTV32435763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd332cc0a8b2619d16b8a6aa3b02c9542c1b9544386ed5ce178319c714b91742. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZTV32435769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa6036da298b93450784c09bcf0c0fc2aafaf487a0aea450f647e12507074ba. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTV32435770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c30d32905bc84be3d0002991c3a863eca3305a4775fe85f8ed8c619a046faa. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZWDD2467013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb328349fe3c807f3f5ed1b64e71e0b7da0ce17285f8d9f0ee8d3d562cadfdf1. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZWDE2496431.