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 0xd20c5e2289754c9229b9cacc7af57298157e72fe4641d1a1806182722d52121f. 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/5dd748ea-471b-4e5d-a01e-f6d7b755bef4.json and https://artists.proofprofile.net/proofs/artist/5dd748ea-471b-4e5d-a01e-f6d7b755bef4.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 0x1e5c15f070fc020139034ca68c51b260d23b7ce72cbf883cc08d8b3fdadfad1a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES91851664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87743253cbacd6d9a71618c2d3ccd93eaf4bf60cebebedb59799de4b4fcd7583. 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/QZES91851665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2719265afe08cd73381f9b396ac34c88b068533eacff5fe2e792290b1edcd4e2. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZES91851666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf194f7b5f783a74a3d9717a51fe76fe0e2c659551f113a68f8d1bbcf4f7ba46a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZES91851667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x499069c073fbc353b69426b35653cbe97d5c606d1415bb1c1b1e852f4f324e21. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/FR1PP2000200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff0b1d55f731774ff093ca65a3a904143bcf683ee2a75a6d2fcae10179236d5. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/FR1PP2400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd818e4484787002261361d7c0565fa66b8849e1e18a1a75188505755b7e781f9. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/FR1PP2400140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb168663afdc0b73ac4562f19afaa6662a5a9162c27d99b1ea1ac4b52ba7401. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/FR1PP2400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb24a6010511b18385f2c755cd840c30db925d530b9661db5ec9190237b679ca. 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/FR1PP2400160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4eea3cb07ded36a2a0d2d785d1891248d0cd5e75fb77d1e1aae1d820d0ba705. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FR1PP2400170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936e7639573d3f35d26a5502287619030239b70258e30ca0375316a881ee781d. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/FR1PP2400180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573f216faa34a13e79251e4f3b26c40e8c3bdf2ea93ea3a9c74adb2434e4e695. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/FR1PP2400190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd60cdb86004872ad168327b06ffd76a684ca20bc04d3944e8611696c40eae8. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/FR1PP2400200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70aaeb0df20ba31ab06cc68cc2abed01f92c3d633d559cd9bd5f3893000c49f5. 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/FR1PP2400210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fcec93db4578f33bd4f650634e352a47d7d9df40c19e99816957f979a9401e8. 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/FR1PP2400220.