thumb|Logo Twen was a West German magazine that was published from 1959 to 1971, and known for its innovative design and typography. History and profile Twen was launched in 1959 as a bimonthly mag
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 0xcae7b9d4562b8c40ffa46bd3c8489a73b4913548fd08da42fab3e9dd7dae2981. 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/28798891-58a3-4920-903e-a9ede33a0506.json and https://artists.proofprofile.net/proofs/artist/28798891-58a3-4920-903e-a9ede33a0506.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 0x9255590913444dd809b48db075e8354832f0d6c259a98e70ad11e3e7a98889fd. 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/USJMZ1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7664206be48072c571d3e139a17f9784a87d094f972697708bc42bac4dab3e. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/USJMZ1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3399b9679b5d52f51be3aab8a3e04476d03aad5076cf871d566be86b92199840. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USJMZ1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d561d366e241e6c0a0e139bcc7b5f7072a4a04c1d9f0cde0c0b48366594053. 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/USJMZ1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad566a720ba55ae7d7f21dbf4439b72756534181c8edea803d77d4a1262a719. 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/USJMZ1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18f3338d11277023461575de0ed50052fb1a7f5f71ca6524cafaff5d003f1bd. 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/QZFZ62087043.
Feeling In Love From The Waist Down - Live '22
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b9121d628e81138b1f0a6fe5132fe4e4de68a1a5783f860b4b71180a20b6ed. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZK6P2310544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3260df1b34fb5870c5d13a008b3562c2e638f2cd5d30dbf01b041edeee520c77. 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/QM24S2405952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8dffa48dc3012cf563ad34a5f3594a4e07c348d3270f8aedc08dc9400910cdd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM24S2405951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc447a5ab09bf15bfdbc276bb99d38b15a72e36226500fd02d2a4909e5d6c1f. 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/QM24S2405950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d4ac71a17edcfb960240658ef999c947ba13e1f11f5485be8855208252f8c7. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZK6G2237140.