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 0x44480fea9eee01c537d6dca8af6cfe7933aeeb30895b44bdd6faeddbdae74fa5. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/645a3fd2-3583-459c-9e24-bd910c351542.json and https://artists.proofprofile.net/proofs/artist/645a3fd2-3583-459c-9e24-bd910c351542.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 0x34183103747b87d52ec6a375a0195347180038e5082088c74a0fdd5f71265b99. 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/QT3FE2577537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02cde5550f0cca985a2e29658391cb731b8b8de0573d3b21fea6e8c0593ff012. 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/QT3FE2577489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b03f72ff6e75c4b27642ae7b0ee01fb6da0bdcf4648f311fbd21cd0bbf8bf78. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QT3FE2577542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2fe3b73369b77395541db3d876e08c184c4b7e2201d057ad547ee836ea228e. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QT3FE2577535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bef7c255e5537f0d8a87bee9158f2f455ab10138b5a1a2d19d12252408518a9. 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/QT3FF2554056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7e627d24a3ed2c99aad68cdc06a1800a90b7c23490de53ace7609835466c90. 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/QT3FF2554057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3e9059a5762f941f6f34207e26676f573e7940b7611460fd9bf5e928d8a910. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QT3FF2554058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871ddfff1f41e109eaaf7fc80017a6ebf69c8d70b478a99ad5f8fb1daa281212. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3FF2554059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f38647ef3d548fdd577c88e5b067a2b0e3c295751288e5aa36453f4fd6698c. 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/QT3FF2554060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469803dd12d2c5a5ea4b374fced158a4ce910a1a266da2cab3269067ea6d5ccd. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT3FF2554061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182f856295574c2fbf897f0e477790a81da97da3cfe2b613eeeeb5971f9e4f3d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3FF2554062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bc7681c36946950822fbefbadbbbdfdd8df9bfc0f383c12d3e7edb9d6173ce. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3FG2518297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a4cbbccf92d8421adb81e34669f08834d4d7df4b6cef7f2e21786d665899df. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QT3FG2518298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a6eb2cc98ae2a3d203ca7a74261dd6f680e8915da982504e013a5e331f2b12. 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/QT3FG2518299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c5487ff5a459c33cd2f49495e5cc0a8969ffeaa14fd386e07a81ef6500112c1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT3FG2518300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647d381dc8c445b583f9321ae1d70d02893a4ae46ba3c48c0579cdb459e5c6d9. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QT3FG2518301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c524ce6a7fb9536e44148556047d0d0783e9bc18f8748e3151d7a059f29876. 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/QT3FG2518302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80bf75db352bac5a357fc1e8ff9405f5144e6428e1e95430b37737dff8fe2ae3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT3FG2518303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd050c4c88c179add1a6011beca943825f8e7a968f7a2dcbcc634e64413e8eef. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3FG2518304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8f7df5187c209947ec8dd3a745e3ddb4e6d624eca85228d7342f776d86390a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QT3FG2518305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1523b27e697521be1d5e51ee0d93d53b26331f238391a30e393124bfc90676bf. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT3FG2518306.