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 0x2512b879902f111e84087cfba32b1ef3a41bb0fb95f92abad458a0c9b44f14fe. 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/827a411d-127a-4d19-9235-5f0c7c6e72e0.json and https://artists.proofprofile.net/proofs/artist/827a411d-127a-4d19-9235-5f0c7c6e72e0.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 0x064e624977cb59f225d6d47b882d4dd4b1c3d8150612cfbe4003a37746364302. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/QMDA61870475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b2235cf87b89d2ed8c0f92d9b484634bad8e5b734b8ba10fcd94fd23701df1. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QMDA61870476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5dbf14117ba3258f8165b0479c6d48e8ac6a674cd874ca22aa5b4786d9e7525. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QMDA61870477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27680c37f7ae80ab9cdb38ed84d9a3c4d75488edf462edc85d7c5660a8c3432d. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QMDA61870479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e5f5148755c77b5722d0cae42fdf3588e615f9c1de8e9e29b3e04c2884693b. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QMDA61870481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73c729ac1d76627382625fdc30b1aadbf58cc00d199a90caa2f51e4ba678a53. 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/USJ3V1253068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d7f58229692a728bba9aa8e85740dec9676e02a96e0cbc36e8a0da6437d5d0. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/USJ3V1253069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032f497f41e1621dc829df27c76f9400afd530adbd58b40683a5b35519113aa4. Chain 2 (Bitcoin): anchored in block 957737 (2026-07-12T18:02:09Z), 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/USJ3V1253070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360b9e5f71b01340f3ed196d916bff39ed4b13b780b126c3326354829f3c44c7. 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/MXF110210235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d229f0191855a40909e48826b061f48aaedf057185aa79ec9b9dc6a7a488c88. 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/MXF110210237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23dbd614f6b13ed268b8d82c12c11766cf24514f9878e987eb68f1d3e6f04c82. 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/MXF110210112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc745959f0e3c6d630e2b0f19077d37f9f2c1855ffe413158b2fc7588698db630. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USZBG1300405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d9403fd807189fbaf4b47055bec28986a0a2432bdaa2b81846d84debf23c23. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USZBG1300421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38db0cad27592f791302d1f45fbaad7137491024819187b641be101f8369ff8. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QM6DC1573990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e74efc714fafe07c8262e5da533aa5ca94099d515b8224e1002a87d10db8aa. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QM6DC1573984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d1fbadffff12d8310a4421bbdda48fd8a1605576fcab2c9c5f41911e713016. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QM6DC1573985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc606f963c07143d82043a1c529a66cf6d0917145fc671c8cfae1bdc135d167b7. 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/MXF110210240.