thumb|upright=1.25|right|Diagram showing the relationship between the zenith, the nadir, and different types of horizon The zenith (, ) is the imaginary point on the celestial sphere directly "above"
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 0x2e55ec9d61cb8503e08d563814f835c277a5a59a3db0646f40494aeeffacdd7e. 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/df4e640d-6d48-4d39-a5f6-e0ed6aed6ff1.json and https://artists.proofprofile.net/proofs/artist/df4e640d-6d48-4d39-a5f6-e0ed6aed6ff1.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 0x8f531534bd8d02b55ea484ac02f2285efdb970212e6238078fc135d154180cf3. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QT3EX2496135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96b362bf6cafd9f7ff8b2440e9f9de2784067b3850d7ad8167573fee6053005. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QT3EX2496154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b08961e8f04cdd70fa537beff7bf3987b82d43c4fef77716e7c13c0b312e44f. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QT3EX2493761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1355e93655909fc367e4cd3007477cfe6099b53b6712f0cd022032a9843a887. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT3EZ2493151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38812af96c1bb7956abcbf5e2192fab0d933e5672e758d0956e6514f0983c2ca. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QT3EZ2493153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829d42dadd5aa316d65e8df904315044143dbcff5263f8a9aff052cf7ea3a883. 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/QT3EZ2493136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74b4196e16f6f689b39f93141e13efe744920fbc2b9f290bb63fb51b941bdeb. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QT3EZ2493163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799127ce733cfddb9aef7a010197094bd3c9b073e18de688251b34fbe100d7a9. 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/QT3EZ2493155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc11c8bb0106c3da2ea2681a1ae5f7db6e1a2969d150a8fa04fafb6dd38c4606. 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/QT3EZ2493140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174b5f9545e43a09839eedb574c9ca99946f0608f9b1caf98336397ec1e6e11a. 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/QT3EZ2493137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b5244b142c8e14dfd1f852c24df5de9b75f86fef296cd485146626fff0474b. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QT3EZ2493175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a3368889d2f95050b27d14ed9d1326a4218164ba5c9b44955634202950e154. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QT3EZ2493173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4901a285d104b4b44b7927ccfa28e0e8f709720cbf82a2469283239a778774. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QT3EZ2493142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31581992a22fc1dcd5ae0c887bfabe637318fa5eb5441cc7a893c7b6feebcf80. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QT3EZ2493156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98df8df97d21324f410668758027080d42b643303ded00a782d67f16587c3e5. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QT3EZ2493169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703eb1b086df030b6bc980eda4418a92e850b1d3c629e63d6e55241cb9b86527. 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/QT3EZ2491428.