300px|thumb|Ascending cloud from Redoubt Volcano from an eruption on 21 April 1990. The mushroom-shaped plume rose from avalanches of hot debris (pyroclastic flows) that cascaded down the north flank
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 0xf7c4439b75ed93e0e1ddb563b08ae843a42af4a52cec471b3b152ce0cc31555d. 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/6fd36de0-02f5-4bb6-b04e-fd6e5d1c5670.json and https://artists.proofprofile.net/proofs/artist/6fd36de0-02f5-4bb6-b04e-fd6e5d1c5670.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 0xfcb9d5c3b84f0135792ecb95d12a5f276c6b8895ea21504de56f09eb6d4cc44b. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZ4JJ1905541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc19a0e3508cbffad45fda6de03b4175b0d211b157604050ee7badd682e9df0. Chain 2 (Bitcoin): anchored in block 957576 (2026-07-11T14:19:48Z), 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/QZDA41911623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4883d2e40c4a5452439e07337b062c057e2e1fe9dcc0c40fbddd94bb253c21df. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES62151036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5953816fe91c89a3272cca61f05cc6e5cfa17d602e1d2646b8c70317d5a50dbe. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZHN72199768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9b381d70650e0b9cb8d120dcf4895fa5d31322d906fb0154ac5882bc3a4a6c. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN62316208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226335ac49ef00e1c09fa957a915f78a5e700dee80e8b5e08a3e8f86fe2bac45. 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/QZHN62316209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a14809e7fb94f8c9fbb2ac0b499476a1baba60c209f5ecd3cdb0283cedb4b4. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZHN62316210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12751922ac7d7f83c4669cb3a0abb5a1cfc665f447b93b87a9d2aa217be2cfcc. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN62316211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063613f8d22fbda280321b128621fd407f224645909747c5494c7724cd274476. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZHN62316214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75b12dc3fb9a1dc715eb76186daa4091684a177b6b93acafa29506cf70cb0e7. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZHN62316216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f90c878606269afe5fede9521b97713f75b7e373683455a69ad1ba4f9109aeb. 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/QZHN62316218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4ec68dbdf2c288b58c80d6a3bdb0e758ff64c73d4c20653b1698a129e89e7d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZHN62316220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf6a9a48cfa967944ecdf269deda45c938ec0b5bf8b7a7b74bfbf341cd01d7b. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZHN62316222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x299501ef31e5c06282530c756d7fc0a7b67d2a1545ae3283d2b4659c61f4c6d6. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/QM42K2353279.