A house is a single-unit residential building. It may range in complexity from a rudimentary hut to a complex structure of wood, masonry, concrete or other material, outfitted with plumbing, electrica
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 0xc97e6a7ea6e69fcf8a7a6b240531e759567e803a886c51aa823fa3af37f91717. 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/872192b3-fc28-47aa-91ad-0b0179473193.json and https://artists.proofprofile.net/proofs/artist/872192b3-fc28-47aa-91ad-0b0179473193.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 0xe06e4c4f30e365691072b9f235b3ed9bed14306307200a9caa72adf348861bc3. 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/QZP7F2419212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2aeaf53be62f04e0b65914bfeab13071df9bc03624811a5bfc70e6e3a7c077. 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/QZP7F2419216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7000f79ddbd2de6723fd19ed23c7d911e97bd0eb940f6d5d08441d1e0c460f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZP7F2419217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd483bfe3651c766bf2bb2e008e71bc0744bec77437231419393a2e14b87def2e. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZP7F2430766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7995b87616d423d8a43cea8fac69d3d2a901edb22b38627e71a0bab87516b003. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZP7F2430767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0298da6259be32aaf2328c36dd9a1af80f27ec06356dfd13d635b2f04aea5644. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZP7F2430768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5057c76f89e690f79f85476356d3688eb802a5bfab5800a5542fb35100484fa. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZP7F2430770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97061a12da01b102ffa442c2c82e5a5ab1feff051ef0c62b49394af1f4af3c3e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZP7F2430789.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90143a2f27d791f5235588d21c38f13d1a3be59a411f3ccaa11da5d216e2f58. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CAWK52474247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1eea04931ff3b91d930695994af34a69fd0d9439bd96f894e8e537f41e97516. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZP7F2563592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0468e480fa3b8af24006a3493bc5f8e222b73ffc963e1c0e1ec5d5a9a47f29. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZP7F2563594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf6a56d25b1f3da0eca1ca5be980b36a605afcec7ca9ae0f1e8723b60ae1c69. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZP7F2578283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c3b15f456152f3d9a13ad980d08e28fb9c7cd793b881fbafd00148aff3c600. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZP7F2578284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f9b3b4baca1f09dd692a17ca485d4c1048fb7aa140ff6bbee819828f2f1c78. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZP7F2578285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a3661b0413288afb09d113eeb6f005e50cc392417bb65f42f93e64acb99b6c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZP7F2578286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec416a00696806dc45c17f91b1400a3e5cdb1c316145a137dedfaf93356c7c8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZP7F2578287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb5cbd0e70f3e69b26eb3296dd538c8aa15dc47a450886ec19181d3d4f5aa70. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZP7F2578288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215794275ef8d7e2d1720d13e102611b09645820dab43911e2b24c4e30ea6d15. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZP7F2578289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca67d4976912972858f5516b275d3098c40c28e51a5abab097bdb1f0e98bec20. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZP7F2578290.