NPV may refer to: Society Net present value, an economic standard method for evaluating competing long-term projects in capital budgeting National Popular Vote Interstate Compact, an initiative
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 0xdf1b9ca0c772725961faa12834d981bf4471dfc55a0204c01a98c9c7aa1f73c1. Chain 2 (Bitcoin): anchored in block 953602 (2026-06-14T06:58:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f272ad2-c5d9-4af0-b2db-f7955a8953e4.json and https://artists.proofprofile.net/proofs/artist/0f272ad2-c5d9-4af0-b2db-f7955a8953e4.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 0x5e32ceaae41e42d9016613fb78e3f1dff66bb387025806a5f47d00ada0ac4514. 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/QZES92108658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a2657026e29ba985a77a12be0159df508392d2db8c5835e0f860810f4c78d7. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZHN32224750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b7b3df0b70512b04b652430ba2676c846c53a33109385968b87e170eddef24. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZHN32563321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b4a953520e75b38cd9759ff19a0890ceadf93065ba5b3ea0cf45455110b1f7. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZHN62558343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67865a78e6648806737eba2e38fbec34b72206f8a098b0b310eea79bb7024b2d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHNC2545473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbe77178dae2fdb11ae24ba8aa386f4f66bdcd9b3e2b24cfef4e57cf6586d51. 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/QZMEM2560855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9eb29131367c75ee0d5f2734b2a97bb54c572b68e0a4b5836f94dba5fa605f. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZMEP2526837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d72fd3a50aee80a8857735cb5494fbe1c7faa319675d3a7ce9af4dacb481b10. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTB22575785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b58a91a8f8897220d7c90ad5cc508f1d2132495ef19d6b4964e8f7c9b846eec. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWY2558526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c09d985624740d3157d02abaa25c0fd8c52d4f2f3dd5d88018dc1d85ee802b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZPLS2569988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1746cde7ab5ea784a4e8f2f92581a309fa825deac1337f9418821c3c33b24ee. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ772519358.