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 0x90286b7782c179fb36f63701182e0f8d043f8290194f1d62604f79bffeda151c. 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/f7770296-3e9b-449e-b247-924143a10aeb.json and https://artists.proofprofile.net/proofs/artist/f7770296-3e9b-449e-b247-924143a10aeb.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 0x5a0e889b167585982ba6a4d1aaf3cc226c139239da6b793ec45a16351ff4a8fb. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QM4TW1501223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf04720f4c2d938fa369c977e3a42e424f96706d4223c9b2280b5d15719f8a8b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QM4TW1501164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03d533912e01a1aa413955656d7f1614380dbe6fa4085e874df36e5b169d69e. 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/QM4TW1501166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52900747dc3488c3461e3169130d04d1ef77feccd1ca6362a544c7a264d915b9. 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/QM4TW1501168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6017fb17a706b446fb1816ca0357ee1e38dca3c9a2ecbc95e36b9650e8ba0c0. 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/QM4TW1501169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705bfa9ecd3471c716908d401948dca4e6b2a2223a73bf4ef3d57b9bdeaa5a87. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QM4TW1501170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0538cab5b50007e9ebe2add630bda935c0d1229441e5596c0a8fa0fdea73bece. 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/QM4TW1501260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618995366968de855fc7374a69c68ff357ca1090cf3e0677af295ebb5a73787e. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QM4TW1501263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd9c8629d81b2e7a2ae66e649670e09338a1ef90eacc4e642eead253bcbaa4a. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QM4TW1501264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11467c84f182a433afe543b0552d6ec9737445ba67562bc325a8f64ce28b346d. 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/QZNW72219662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38418814e1fd6a6cfb48273eb432b173b5686f4b93c3783ee5b87e9b358d07b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZNW72219667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf031ca1ed6beb35bd7bb7f6f316df0c93830f8e036402cd2363f92b6569c7912. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZNW72219661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11467c84f182a433afe543b0552d6ec9737445ba67562bc325a8f64ce28b346d. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZNW72219662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38418814e1fd6a6cfb48273eb432b173b5686f4b93c3783ee5b87e9b358d07b. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZNW72219667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f927a9fe95b281a61e0c4b9df5605bee7722147e803d41c57a82155202e861. 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/QZNW72323839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf569c89dd81e32e78f3e3663549a32b5f51e0f08800af8378c282d3770eef494. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZNW72323845.