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 0xfad230d3f67054dca297f77ef2805f24afeefa3da0167f2172ae48766c20113d. 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/869a6901-cb43-4aec-a00c-fa0854448d84.json and https://artists.proofprofile.net/proofs/artist/869a6901-cb43-4aec-a00c-fa0854448d84.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 0x0bb0e6519b7dd513ef227d47684360c75a4f21362ada33b3253bab9657f35586. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ772451175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3ad47116cddd0b3dde04cb14563a280eb8f71e61cd1218971a2e239be5f408. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZZ772471529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af4ba1699d967409205bf0a96e4c7915d7c31d95b41e8afc5edaccbb6fa7974. 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/QZZ7L2432936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d2cd539134fd278c9c0461f24869a5f847ef38974e4ee65b448afe0d9185dd. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZZ7L2432937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f3ab717c7de11e845f333b3a3b2b3e7082354c138bec8fe6b836fb2cbba09a. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZZ7L2432938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc261742536bcc0c8be002a1a99e394f40d6afc811ed231dce16fa4199e301db. 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/QZZ7L2432939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178420c9b50194d9866fd0e6bc995352715a24be7e6fa645e47efb7b85792462. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZZ7L2432940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb874c38a15ee4e84c01e68d9c2bedfa987a42eb1cefaf1fa1b0bf16c1222f4. 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/QZZ7M2495999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02af55e3334fe3e16248339d12f6940530cfdf57ba5f7bb586ac47c24702ccf. 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/QZZ7M2496000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66b4037f364622dda5e14e06b4e72c78efbb9b3f86c384ceb3d9219f4f02e6c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ7M2496001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8d0afe3aafec4bf178ced93be693bd2f0c23325a24afa77de35680795c2f86. 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/QZZ7M2496002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4237b0b477f14be969946ef35314431cdd1ab68eaabc4198e0057b9755b48aed. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7M2496003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc261cf4ca6e5309101ceb5eb30a987342e4380615fe098bd74ad5755e9fc2678. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZZ7M2496004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b371ebfd57dcc0bf2b0bbeb7be31ca80e1c9698e7c6e0e5bb35d084e4e24c60. 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/QZZ7P2497545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ea585f078fe0726780069b2d84747d0f6d7c02bd336283cd0686f4a4fa2739. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZZ7P2497546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf687d8dec5f84846e397bc70ea1ef5730e30ca0d9ef76a9932942892fda1af1c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZZ7P2497547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a141a00baab84c08b06f6da0c7152ad26cda1eb8c77831fa79828691b74764. 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/QZZ7P2497548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f3488eb17992dbf56106adb89a212748e70b1b850bd43117516dd994c7ebff. 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/QZZ7P2497549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c2a6145b06d9e9162e66ed4e2f6a0e26adf6765c74d9d7532c9788baf519ff. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZZ7P2497550.