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 0xa96dd9ac6c28f31f69ade300ceda1087404e6c790fc4dc0c08e46391a832ed4c. 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/d2409736-77ef-4827-b36f-c6c767ac380e.json and https://artists.proofprofile.net/proofs/artist/d2409736-77ef-4827-b36f-c6c767ac380e.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 0x7a47815e8e3e99ec117892e90460add854dbeeecad840b8eef47c3978fd22194. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTB92339512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011054dd10f7622d347939303818ef4cd9fa3524d168677b16e478a61430d90a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTB92339513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d00825f63b88bcddf444010afae213dc2d223f2360f7e7f4a08e5bbdbc75cc1. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZTB92339514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d14207e15a80abab0ba8e22a702d58a03536aac09562603c7e992fc3bea7522. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTB92339515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6f42a2ea97be71a91a6193c455de83740f9040d76a819f4fbd6c5f4f8bf9ab. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTB92339516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5950e256676be71e8cd9a82a14ba1d73ab62b013d4711a5f0375bbe3e6eca6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB92339517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70e4fdc4f70ee83b3dd8ddb22744cd8f969af8ba6e24b6e8c36e3c7869cba03. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTB92339518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4472dc2b4ffc1500cafc605fa61ac8d7610e9c417fe87b7fa11e120f7271fb4e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTB92339519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ac9e799bd93999f6f442a235e594194750cf534d74dd72bbcff42ce2000443. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZTB92339520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf727c58e1c1f68ba9484345505dc1dfb46fa9974abd3f7eaee22cdda79bbddf9. 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/QZTB92339521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f826fc12c8071985af4259b6ea459834d39761b2ec789c4c49dfa03537adc3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTB92339522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3bb4ed0e8bd844efe0ecfbcdb9fe368268fc5fb0cdf393265a4e538c61ef77. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB92339523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b6bd0e4f536e93689f3cd3b36bc73d58be3d15e45d6d6b3307f273f8cf7d5d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTB92339524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb04e6be99a46c3390d8055cd22afcd7c1e5ae4e648d45389a79f688d4eecd1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ32324262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350aff3565480ea3b59f79acde7f1dad11b239ef54d0ddc1723c48700254ec49. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTB52296255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4516722affc4d915847128bf9fb95a2e657756feae6fdd4077aff8d4cdd87c82. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZRP52254916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3377df1ebe2edbcbbf89d27d6e82197dce461d841ebbb72fe22d493a8daf46. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZRP52254917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c44bf917d753b96d1be73175692c62a537721b3ab23c0f4a82edcf1d6c6745. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZRP52254918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fcbca7ef26046e61cbfe6da8a75d82faa86f706287a26d4566f2719e79f8362. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZRP52254919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575bd931562389c54b04cb984dac65c527831713fbdf8d2a15cab21564d805f6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZRP52254920.