Sevin may refer to: Sevin (given name), a Turkish feminine given name A commercial version of carbaryl (insecticide) Sevin (rapper), an American Christian hip hop musician Sévin (surname), a Fren
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 0x002feb3a497def9bb1d4876c3f49f5f20fe214023d09725a7d1c6907c588333a. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84444a58-42f5-4ddb-a2a6-5dbc92067131.json and https://artists.proofprofile.net/proofs/artist/84444a58-42f5-4ddb-a2a6-5dbc92067131.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 0x8650f55d8d7efff6a5ca31af0c3c2ba7560249c29e2d26c8f78abddff9032080. 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/GBKQU1801694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4b5eadcbe23b11794f63db0c38b58c54ebe030b6886d9efcef0824b7eef822. 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/GBKQU1801698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe658ba52a5e91c9c6fd2cc55a758d6d2c26655de3cb109d67a59d4da26347722. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBKQU1801699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959ae830d858ba62f8104b47304d10732c58b3f9932c3a6ea72f88b6c266b24a. 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/NLCK42235214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fec5e9c78d659ebc5fd158bf5be107f8bb624006a2b4ecdcf62bdb80ec85418. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NLCK42235216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ee6ea8b4a06351102a1119f9d61d27d4a4162b14139e1e4fd8e2992bdd8af9. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLCK42220402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x382f208b533323ee3bfb01caea3157675c40d79269f84563043a90b3e91e67af. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLCK42341021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec674993123544078311cfffaa4b0424de34afd36b52fe1d5a1de380b93b14c2. 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/NLCK42224667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb449293742ab95f6676a331536224fa189d287dbfd0d9055bcb1a0a0c0985297. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLCK42224669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572f624d70ca382b7446cabae009c285d243a7b5d6fc2214de60ddc3b05b9111. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/NLCK42224670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869db8b295f60e0237d47bcc466cf327b24e4c6d7cbe0d6d170c6704f7309ed6. 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/NLCK41062707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbad89d426a27590c37ee9a641dc1c6a1b667f920830c0af726e3bd35e458728. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLCK41062710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6df42cf3b875bfbcc161857f571edf56e7b754a3dc28fe0a59524bad55a2342. 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/NLCK41062711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77e09115f19ba85308ddc33a53919a9dff7b3e7e0f4257704938899200963ac. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QMMQT1200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2d5d98e381c65ddfb7d9f975b8ce4ef52367fe03f61af1843d87d30dde407e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLCK41014900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eddac1151ce7e71f20c484df6005e863bd61ddfe815dd48fc010a3f9f2e7278. 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/GBKQU1152055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a95be19fdb9ee20c9d728713b376eabacf5547e38664765bf2ec0f8ddb99811. 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/GBIGR1528001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30e1c0c50941b44e90ff33be549e2567b6241a2a00de606b66582874c78a900. 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/GBIGR1528002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950166eb6e0db3e305012f08fa4a1e03146dfca6ed196326eb7f2302d50bfe4c. 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/NLCK41095486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5485a9b5ca269e85dbb229df3acf853adaf020e4f9ccfc3d75d67e8e37ff164. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/NLCK41095487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6167a7ea3ebf6de023121afa139382e391ca4585dd2db6c5fa1481e929385aa7. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLCK41095488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe945b2524ba2e45b271eef873cd614e7679b416ace9c419ac636bfb7dcb77829. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLCK41095489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceffb4a3fe88a6aaf406691b093ad026b0a9ed23404d0f0c748f2cebd6a7d8f0. 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/NLCK41095490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a9486a09bc22b4466e9b8092c77b6f38c3efc97d2343b5a410722784ababe3. 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/GB8G41200601.