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 0x161f0fedf31b953595e03478224b7e4f41950d4781762a74a637305046faa54b. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d780efe-0ada-4d72-b565-409cfaad7a82.json and https://artists.proofprofile.net/proofs/artist/9d780efe-0ada-4d72-b565-409cfaad7a82.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 0x4c091d47109a6ea47cf9f6e08e617b96798d0690a30be8201dd842003943feac. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHNA2586205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b79ba67af705a2c698ff325567e2821e2578ee2f8ba77f94e55a156f630bf5a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZN882526124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd39ab4b4aaa87e0035155ca63baffa0129b2daebb844a6fbcd0632bb8662a88. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZN882526120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c1cd240f1e71d570f3cfdfc9e5ba04df7d3036348c27449ec139e3a0d1c414. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZN882526121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3093a4f267665e1e6e9a9a959b8011f4fcd1e6f2f8840266b97170ae6eabe58d. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZN882526119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff00722f8c4bb43ec7f7dc4055108bed790831025eebeda2c016e6e338709eb. 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/QZN882525237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9454e84b047f5d33d425e2dfeb4a521621216a0cbcf9769803f0e46cd86d3a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZN882525240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e27bd8009ed550c6af769de303bf5f9f17c07f3fe191768da1587073a3bd7b3. 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/QZN882525242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ba935b821d6b52abcef8adedfae55c03298a3b976772b8570d4f45175b68ea. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTB42292722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf236c7f4cd18ea611b7d0ea062fe4616b49cd5cce3b9eb5de0eb6e3e470b8d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZTB32250929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf88775d914b44827e0cdfa0e928d38972781a4959ee784cf9eb6e80dffdd8f3d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTAZ2271756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfcba711349e5b3c129ceacb89f51c4ec74f87ef29e3f897a767b2c4e52cb51. 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/QZNWZ2292750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d3e10b83c0b7dacd19ce7cec0b63ae3b9e630cd678056785550afe55a9d7c1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNWW2293159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95b6aee3bd05ca90251b708fd09f316c22f081d87bd9d77d18f92723d9fdb0a. 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/QZNWT2212237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150f45f6aca12c350a77091f7ef2153158ce28a5ad3e104c5a456cc6ec185da6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDA82255748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1790eaf6aa5348155a979c4c50db457196ac55a93119b37314e841f475f990. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFZ42298617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0253c0d6900a0d1268f08e437b84f15fc2dd0c06784e926a5260c26b7ca32a31. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZNWY2175359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ed405ba24ab37770fcee2efa8db07bdc3206c834eaa594310702c287171e3e. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/QZNWW2151839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2731a59bad83890e73e03d9f49900f89c7b736493885ae0e18e6d79b29699c0. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QZNWR2128465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29926d208838bdf046b5207033540a7fff3d63d339caf904ead12f5a6147875. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZN882525232.