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 0xcce58d6e93b952cf6d73ba35982cf78cfa76a22d6e4a9384eccb6807902dc366. 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/38745420-5bc7-4973-aa27-63dc3d5bf6bc.json and https://artists.proofprofile.net/proofs/artist/38745420-5bc7-4973-aa27-63dc3d5bf6bc.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 0xdf5aa8b605db7f5547ed6df35b42bd2b50b6dd592c575e7c725729115efe0a5b. 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/QZES52082838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b63b6806ca5fcabeb25f7b8a9cc8c4dc327859bc2b016bbae9ac3988632471. 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/QZHNA2002187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7943f1c243a8f6c3142c15d8b8d5048c0185fc316817c40514dc5a775f9f2ed2. 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/QZK6H2022018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ce873497c95a8b3ce06dc6b70fcde2b372371e39c0c24b8a78ebb495e71786. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZFZ52140524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9309bc987c63f828e5367b384f4a84da43b5fde3571c1d82cf4c7ef5e7182c01. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZK6L2159107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd193fdc7882c8b6e1dcd0d0f11f62b6cafbcd7414c499e9241c8573f57ea6ac3. 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/QZNWW2136450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e7996ea3242f1e20180bae79ecd2d3c6ea3b53fc0dd7b5bc4c7b470c379adb2. 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/QZNWW2136451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc92c60b96d6dc2fcf4348c419a3603e5f61d7db75b350f53730444b8bf3a665. 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/QZNWW2136452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcdb9dae2c5a0009702db137115f6cc0beda9c5ef037cc98c3e1c1d7042f9b3d. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWW2136454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6eabad84a8db786255e00d9fb55a669e376ab528841c4c0ca151d150b8ae98. 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/QZNWW2136455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ccebc5bb5370b2461cc3b8d937abe1ebee5e9de6cdf0daa7fffa4f3b523295. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZHN82227528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa641a6332f964350f20aff7a441c14ee48ffe1bd56b18b9f101a609a2714d539. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZK6M2290741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4e3c652f0f3a7b6a478aa1cc281d2da78c4c40417bc95765234cf8bc0b7198. 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/GBEWA2404220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e6e2237a35928918a9bfff113eb1d8d40ca879c2694cb578026e4e1c1441ad. 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/QZFPL2400173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3dd18757c46234d6ed269323761db7a5a53c8e765c6a8577ab1fb8b7ed9d39. 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/QM24S2502714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3390048811cac535af94ea4ea6b93e1e62a1cf29e4a3b3fb930243aa7fa115. 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/CA5KR2545667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb7de4b94042a9e924762c5e1d1fa460d584129c999746df6a0b7856ff8a22b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USWB12305613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c11756942ce069cc27f399310177fbe3da1bc06c53988b5a771c93c5e70549. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CA5KR2105902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f01813fa194ae29b9895bbb0d73b6ddbecdaa609524986c8505704d0d690c0. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QMBZ92259314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46386f5afc3b2b13f15b8469578ace2390fc5f6d1fc182d10b9412f8d3aa6ef4. 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/QZHCR2200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46386f5afc3b2b13f15b8469578ace2390fc5f6d1fc182d10b9412f8d3aa6ef4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZHCR2200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf228a2765de5a6807408213576fab861e33bd37fecf29bdb270e9c5677e1a580. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHCR2100183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46386f5afc3b2b13f15b8469578ace2390fc5f6d1fc182d10b9412f8d3aa6ef4. 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/QZHCR2200063.