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 0x5e2421d90dac2ddec3ac4ad0e2f96c3fb3baeba191fac7c015fed8c54a62118c. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8897143b-c261-4192-8721-5422eb7f0c06.json and https://artists.proofprofile.net/proofs/artist/8897143b-c261-4192-8721-5422eb7f0c06.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 0x162c823cdf561cc28d22971aadcadc1e150a7cd32cdcb2722b564d1d2cd5d7cc. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZVD32300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4742a8f50822d54e227361d99b6041b392781580e8af903b3a3ee5e648ffd2f. 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/QZVD32300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519fab7e7ab03260adc46153dec528298717ca1e196a28c9d5293732f1c4063d. 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/QZVD32300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb23973b2b83dbf3859dd0fdeb04a7c309702db9f57776a5fcfb8b8c8e98d5e. 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/QZVD32300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdced782597d269764ea23671095e840b93e4d2ba5eaa5326e0bb3e52b1638e0. 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/QZVD32300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab466ec8fee43b9f23042c94b75e8132d8effdf4522d51c672fcfcbc989c0440. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZVD32300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5974ac73e5b153d8449f539cbf722e0ce70e939b3c7f8ba93bacb88634032f. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZVD32300034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33217a24fb9077ee7564508d8b0aca0ac2e37f27bb7f8ce208ad653bf5057a17. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZVD32400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c3e9149a9011cf261c95afab67fe906b1ed0d9fad379f490ba3d2be8d2f640. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZVD32400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60f15b15143a4adea43b2a964b1332bb7e401d838b126d08b026c88ce41f522. 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/QZVD32400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60f15b15143a4adea43b2a964b1332bb7e401d838b126d08b026c88ce41f522. 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/QZVD32400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x018855f01a4cf6336843c25e68f123319387fbf0e9732eba21c478277b3af5bc. 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/QZVD32400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75d445bbeae6e41f6c551dd43bbfbd074e1c2c54ca3274f28f170516e6aed2d. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZVD32400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311f161c42735b242da51c5d29a467dcc34bf11282af9650bd94a4a11ba45227. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZVD32400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e0c081bac0fa12d67c8e8f5f54b622c9780f5bbcc2352e4a33afb16ce2efb6. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZVD32400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a39c417be4dd70d039234f189ff6913bd32acb9abf7389818f63e149fea74a. 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/QZVD32400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c075c3fc84ece954e7cc5066e782509be5c10ba76b6e330911b79c6e9cc8f7. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZVD32400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74f719c777c709fd2bbf83a95a582d93fca5ee70e883560c8f10ca6c1d5e93cb. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZVD32400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14b72fa8906741dc312866efa2de67b8f1dcfd865a66f96ae03f48c4386a586. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZVD32400020.