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 0xb9cf946bb3b5582583f95a5e7c519bec6935e67e2c4367256a7281da0fbfe9c7. 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/584c2d1c-c0ef-47ea-8be1-f59d8459f1c0.json and https://artists.proofprofile.net/proofs/artist/584c2d1c-c0ef-47ea-8be1-f59d8459f1c0.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 0xb381e0011f0fdd25ac58c69af4a9b5e0621117018907ebe33667a63a4b41261c. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/US7VG1881395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435ad5cb7915cd63a5e889ab9d826922b43c0d37b5f7fc8d2866a881fc08b72f. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/US7VG1881389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26501971a933d4fdba79e4f80ba41b9f958a6162cd52fea65b04fd5b6b172f37. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZGLM1910628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db722a9b10df304350cbc4116cba71e9254e4e58a1ab81ad0c23d18cd495b63. 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/QZGLS2034633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d459f7ad67b21533f268a37d72b970b1d328af1f34cebcf015aa378d96093dc. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/US7VG1989939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495a1747b026ac9c415211ff74eec1e6f40a5054f81e903f2a937574a13baa78. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/US7VG1989968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda20c444471985f22b71ae399509729a53bf389e6c568599a2d751ccb24e2f9f. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/US7VG1990030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b126ae925898d251bf133ee4138b2e632b51d0148d9ae0d91e5ffe6653e99e1. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/US7VG1989995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefe87aeef34ea85811b6c2f9a1bc691b1e18c2dcf98b7a9a79a86fd5cb69eb5. 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/US7VG1989904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8eba9c0e0e5039bb25010769c27d1bbcf552b21f3435da5b40d3fe604adc745. 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/QZMZ92032942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ff9af3829893c9ef1626215570db71e586ee41fada8445e458379b2f8fd152. 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/QZGLM2185237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96bf464c25d42ee8a15a401c8f5c9e8927fdde1f10e929f685ef05eea2023d5. 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/QZHZ52167855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f75707eac9fd70763d80d2e01217c5fae3984058e9e10a374eef139de92535. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZHZ52167649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fa47489686541bd44ce5df1eda3ba691d47473848329cd622ec1970249f36c. 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/QZHZ52167829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd0ab8102d2a72a97827f316e3bfc986394b52e3ae3c9ec8ece141a958914b4. 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/QZNJW2516657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b710bdc623f46f8d0fbe36e82a41f2976e2b49a76d6c11f24482eb891a818f. 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/QZTVM2534887.