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 0x6fcc930377079a3cc43ec44d169189a244d295a03f271b4452b4a36e0fd18f16. 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/e91d7c70-e291-4464-89b2-7ffc42d39363.json and https://artists.proofprofile.net/proofs/artist/e91d7c70-e291-4464-89b2-7ffc42d39363.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 0xdc1abb73057a89ce2edcb9c3ffca8be23185b299da6084c728a2872206bf243c. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/AUEMK2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af02bbeaac2f9653d1e85ba5bac931d4852fa72ab669b0e6454857323663014. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/AUMEV2155232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0889187b824edd4f9dfc8ad533e03e5e221e2b77431f2b54016246714b5b4357. 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/QZSYP2254069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb40ca58f1b7ba6ac1678ecec679efb7e5d250e16b0cebb54d0543e51f3995cf. 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/QZQAY2371570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cbaf5fc33fa1f76b12f2652f6a49d46fa05bb37aa3d4969df985bd7b638aad. 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/QZS7J2324426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d3bc2f6f80a2ef0a5a0f9ff5d6daed5ebb636000256e3aab6bec098c493f41. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZS7J2376348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69611ddc30afbec114c84bc4abb5ecf0cbf0c5f6ed439a304e65e2e3dfa716e8. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZS7J2402437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f0da057df5923b7393371a649546cd5046c3044f393703cedaed005664ad5eb. 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/QZSYP2446672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0889187b824edd4f9dfc8ad533e03e5e221e2b77431f2b54016246714b5b4357. 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/QZSYP2254069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cbaf5fc33fa1f76b12f2652f6a49d46fa05bb37aa3d4969df985bd7b638aad. 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/QZS7J2324426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d3bc2f6f80a2ef0a5a0f9ff5d6daed5ebb636000256e3aab6bec098c493f41. Chain 2 (Bitcoin): anchored in block 958204 (2026-07-15T21:33:28Z), 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/QZS7J2376348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed197d8f4312f5bae5a8c3f546bea17ac153f95c56531c3c3304017258b2e13. 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/QZTLA2417053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccd04a45e9bffd8c9ea0fbbd1a83577b6762ea87d277a2089e6c5cc8402d3c0. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTLA2439254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69611ddc30afbec114c84bc4abb5ecf0cbf0c5f6ed439a304e65e2e3dfa716e8. 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/QZS7J2402437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb40ca58f1b7ba6ac1678ecec679efb7e5d250e16b0cebb54d0543e51f3995cf. 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/QZQAY2371570.