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 0x81485f300484704ddfe5163d0d9936b1e743d8a30d70d8f7e233748fd62ec152. 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/df655a33-1706-49ff-ba49-001e380c66b3.json and https://artists.proofprofile.net/proofs/artist/df655a33-1706-49ff-ba49-001e380c66b3.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 0x3d5ae6ce92b8339977ed73d2ef8d470027be2b447cfd78f0364c5832e449f7ba. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM24S1902270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c2f4b2ab5298610c40f8c0afa20d97d8477164d192d2f7d2d3bcb9ffd1b7cd. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/QM24S1902272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ec8ac1d13d3e4dc3989fe080dabddc1850dad5c30549b841387a24d1a678045. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHNA2161332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6cd31f25a3f488f3e91424dafc3b272ad23db0ddad113006d1ebe66d46dd5b6. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZHNA2161276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e2759339585460fbaaded288c63d75521bed10d75d09e9c6ff39ff2ef76e39. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZHNA2161885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6083381c24b94ca47729bd148f01520a9ec30624f3565387294d7e83ddcd320. 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/QZHNA2161311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce06ce82deb17d733ad589af509e4a4ae0d0fac1491050c806d0196a6ea5e1c4. 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/QZHNA2153910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba3cc92b95580f9648eb279db95aed61e2a004603f06a047c1ee9fb5fc5a98e. 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/QZHNA2153912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d873f124f381fd78d4b6c3d8ea5558da872259a9659cad6b673b9b961f7cc80. 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/QZHNB2146528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d0578c44a647ac33f91fc276bbfca7acef85a93ab25163c38a48b29ec40b6c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZK6Q2162218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2877de3a2c1c56d2bba0d2ad17122185f5f610e23e21d4e699c07c3d6e074a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UKR6V2182837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72fd3acc5f8ffe21bc3ba5b726581432d9c940eff5288e1f891e94f2ca95d958. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZES52295369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5091a567afca9a2ee89444340a5abd1a633b1c48d63ef6f943241cadfebb5af0. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZDA42343511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb50ae485688a646f4500c71f15becb282e432796dd695cb191f813e7f6bf44. 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/QZNWZ2374924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bbb0b19b60087ec9facdb559f9a930a81cb27b4203dcb0efbd24f5680a3055. 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/QZK6Q2467156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0365aa9a7c7826030321e0ac5c3e4310d12285061e53d30681e7cc2dcaeccbf4. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZK6Q2456438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0198ef37c62c8ea1bdfff228eb057499b6b416435d8951acbf31c49750240728. 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/QZNWQ2497568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e3357e6d9eca0dfee038c185d396183200ee913bdfc2f720702def6b01458d. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZTBF2485350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932494abe6afd1455886e86bc901c0f77a43504c78679662eca18c6d1c1680ae. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZNWX2540204.