340ml (pronounced: three forty mil) is an African musical group who originate from Mozambique, Maputo, but were mostly based in Johannesburg, South Africa. They have therefore jokingly been described
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b5b58ad9ee4a52beb6cb93a949bca5c7cc4cb67a2284f7f99561428c32383a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af43a872-27db-4087-8b6a-0ebf835ed47d.json and https://artists.proofprofile.net/proofs/artist/af43a872-27db-4087-8b6a-0ebf835ed47d.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ad5df165f4f086219e875b73436ae40ff97d65054e02c9ba1a393109b6f401. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/QMBZ91948497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e885e08542a67d1e57c94273cb01b692390edad9ddcae9bd14fd855d2115ae. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/QMBZ91948498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2026f3e9850e9937825d8ae000957ba40d1ea5c854bd26f30c89cd8c2059260. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMBZ91948500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4eb606eb292048da1f93d6a2846bbf22d6cb7b40898cfe214dc843deb72de61. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T08:32:52Z), 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/QMBZ91948502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc573dcb48d61250d704507e971b5ee7307a025348e4bb1c58c996e0e25496455. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T16:04:47Z), 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/QMBZ91948503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45983fa8de77ce0a760aa2b19b1c4c76af4c0e1c00fc5ccfcebfd7fc957af452. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:49:33Z), 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/QMBZ91948504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe097a2c9b33752c49c8286bd2aa51db4c27401f16d100ead37a469720e7a01b5. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QMBZ91948505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ad252367b24d33fb62dd81b2a27b70bdb5e9ce3315b07207afe021209045a4. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QM7281997648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9083da4add8dc120dbd582c5903a9ea35ca6cfa3f0b6f4392bb095d6ccfb38. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QM7281997649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8986ca16ecd945daa7f1c40d0ef8811e1f314c823cf8bce3b776567cd4c4339e. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QM7281997650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8b5dc7b9ddc263952285987826c72348a1fb5ee18cbf5b9e2658f55efb0976. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QM7281997651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e600a069ed883bb3dc39b20542dc71118cf2ead1d8415b9b9046a836e313bd7. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:00:06Z), 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/QM7281997652.