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 0x4e534b9589554320ca69ed681ba9d2d7a92e70b2e18e5ce9ebb12a8e8ce5156d. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d8cd4ba4-4ac8-416a-a96f-54353252f190.json and https://artists.proofprofile.net/proofs/artist/d8cd4ba4-4ac8-416a-a96f-54353252f190.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 0xa9d8772ed059509b1f2f124c42ef0f375c182b31ff5108c7044ed7c9c72d1515. 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/NOKJO1801040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66117b8b964b11e159d3e6783b80bb638c334deeeb6eb0d1bfd17da538a8ce0b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOKJO1801080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02857e4eb7174c57c0af2fd1784949d1b01949b0f79c19e3708661ccf474c640. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/NOKJO0805140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df65e2ee03f124821f32258508ce02fa403db3b74e9d28b4bda08ff48907ab0. 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/NOKJO0805180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648b6c68b87b975fa3cfac3c2379aa9b0982f457df29d612567dd01a752060ee. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NOX9X3591207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55b2a234beb342f145fc7c40b342d70a39b640a7a86a202450a7c16a7e36252. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NOX9X3591213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb326575a878a80b13d69c83f585683731a7ff758e21be7ef1198c91ec329d26d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NOX9X3591012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3e2b651d280bd6abf9208cc506afb05a840a822eaf7183558e9059893569ac. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/NOKJO0103010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b7bbfb7ce411b1812c600ddf38180c00ff3df8a0be9d8de0c4f0519fffd55a. 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/NOKJO0103020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9180b347b583eb929eca7b4514044c141b8482d2653b503ab8aeb37cbf98e9cc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NOKJO0103050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2920e7100222ead0dd64d249db4c995a617a32eac8205f9bbdab60518e64d89f. 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/NOKJO0103080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c9a5dccb86cbf0f938a2c6dbfb1d73029b401f32a66268bc1eddb007f6b5bd. 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/NOKJO0103150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aab99ddf4076dc9f6e0c0edd6279ca84fa7f7ec51e58174beabb5f352f4ba3. 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/NOKJO0103190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0433f57f531d62affce9ba5a57c63e1c88fa4be2604c74e21b7c5412c75997b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NOUM71501737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79313b6e276601f595ce591aeca42bd0a88d054c423eb3b5b6533ffd4bcfa4f9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOUM71501738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292a0f35bfe58d4f88cc6616fc0c918736c83b9f733d5752e1413ae7639fa7ea. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NOUM71501740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623212f965d10cf958fd8085b3d4520b209a6ca0be6bb9c88acb4f3e5ebae04e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/NOUM71501743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5723efc1096b4160f5791109caffb85c1e3fdea97923153698c97c74c71ba8. 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/NOUM71501744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3edc6321c246e549e4d3f1f5d8531e23e3ed9570e66f444b7a7e888acff16e. 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/NOUM71501745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217c735f7714a97278c0918b823431ca66f4ae93f84dc086c1da472912cb789e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NOUM71501748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6f19ce1122b7ef8f62e0a66cfae05d33f9eb27dca31c51582253ba35fd2875. 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/NOUM71200353.