DEFRA may refer to: Deficit Reduction Act of 1984, United States law Department for Environment, Food and Rural Affairs, United Kingdom government department Defra (), an Egyptian town
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 0xfb790230757dabdb1cdcb02f1cc4b820c79de2d3ad4e318c6105d9f3865afcfb. 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/c6e3bc4d-cc61-4007-8fcb-02cf21e2b51d.json and https://artists.proofprofile.net/proofs/artist/c6e3bc4d-cc61-4007-8fcb-02cf21e2b51d.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 0xa8bbfecc8f9995bc0f339a618788b1ce39eaff1e94610c9bb945dcb115f335a4. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBRKQ2297000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9078277202b0abc639bb27504d8b622a4e12cce5bb8f2f60f76af8a0b35cf070. 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/QZS7J2180233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf820be5d4da5239e3159c57bcfeabed7ac467f1bb1286fee550230e7b5cb742. 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/GBWUL2162001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727b25e96fe4ed4cc52df3c948b7dc946015355905d6e71cfbf898ecb71ce7cf. 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/QZHZ32244695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02163b917e6cbbf71203bfd3a840f48f0af07679642d83bf79b6d09996529226. 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/USLZJ2190801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df354178be556f830f0c5a6af7c03c66811ad4f2ea15643bf7830a8303e3734. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USLZJ2317540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db845daa89e0bf2c2c3ee999a7fb9bd6697d37bc6870addad9fbb78940503c1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES81949996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c65c55250e796d72a3a8bcf94acd01feb20127ea5984d43474975774e6df89. 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/SE5752007490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066c2f0978b5598e135716b310ad1c643c10ea2d7cef3eb289aa0a229ab2b4ca. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/SE6HN2033931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59af2543a86ce71f8ff2c1849973c2c87bc78918608decfb21ff6ed386989ccb. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/SE5752007491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16957293407ad256841213e7cda658c13a0f53ec65d71611913b5decedca44a6. 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/QZHN31921531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a05164f2bb1a204590de708e8a4cb7f718105096801108376e7cfcdb15891d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SE6HN2050327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c7ef9401b7842ca7697b500c24bf13f9ef6423715af0fa1bd075f4dd8e1567. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE6I32089783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01618913da42bc09a3b4af052ec75234b10c630c044b2d3798b1a9982b462cf4. 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/SE6HN2050328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e84564658cb86382a1297cd343010a4556f7ebe19b2b7e688fd61893536dbc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN81914819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4c76f2faaf5537f98245441385a3a1f08e28d2ca930daeb1aaadd2fd1cf2e1. 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/SE6HN2041723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99610849e2c8b6e6216e216964e676be3fbca1ff327b559625cf857b76c1a6eb. 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/QZFYX1925016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c7c18aaa69f13022be774667ae75300bf9f8f441c98295ee2c3f24024047f6. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/SE6HN2042275.