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 0xe49eb45dd4d423d284fa29d0b29c3f9bbf09b172c485857510867d45575624c0. Chain 2 (Bitcoin): anchored in block 953955 (2026-06-16T14:29:53Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/24c5ad41-7f6e-4f4d-8a85-403074811f27.json and https://artists.proofprofile.net/proofs/artist/24c5ad41-7f6e-4f4d-8a85-403074811f27.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 0x72fd9b5f8e8fa606aef6216b53c384885ea24dc8e6bb7efb1f6309f8ff7af6f5. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QZNJW2040005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3444bdbb7b014857f851195cacd597d6099f73bb2d70b79d71ea25886996507. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZ5AB2148034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9304ede5a1429c983dda607136b4b7b535a6c6a9c41f8dcb489e0d7c297b42f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZ5AB2148037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad73f109ec502cf75898c185331b81e4c2180d49cbb0553e018be2da9cb76cc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNJX2215868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a5275e54b66d0e0ba08cfdfb6fd75481c31af89cb66ef41fb439b51c037ef9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHZ62274957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149debcb27d286a1ea069e5dda5d90419d0a9bbbf5ff7fc52021e1d35349a12a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJX2215871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682b0051b38b960d79052bafe9e629becb9b7258b0b078e075d9fd3b3533f6a6. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJX2215872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20d64c6189e8798d01ad652dfb75c9f9200b788f9436b0e251a7336b1b5a764. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHZ52224431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51771942259640d1a3b7a87ece51f5d4c1ddf9d0dba17191aebb3c3427cec7c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNJX2215873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ebfcc48777245906a62462c577c7b23eedfc48bddfc49377c89af5875eb9df. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJX2215874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54683721c3ab4febc0e120f67b2cb400377cce09bedf75dae58f72a28d855569. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJV2202518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c72b0d380434008a8bb64e5020f4da73b400e9422574b3fc1986fce02212459. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJX2215869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7527507e6bc6f8135febafc5dfd5bcd032285faa929837db711cefc4202d6b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJX2215870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a66a44261204f8472b5f5dee580f0fd949ce4a9435afb40dbb10109a28ad3cd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJX2215875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285d30475fdb68889443b8d2a34bd2ad6ee1981c142464c5e0e248c4b03ed9de. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJX2215876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08939b83ac52a4e49286109ceea5c2dfc9b2370c560d920881f5a7258712e56e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZNJX2215877.