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 0x49f27709a4c6cf9076e2270fe62a9760f6ad59eacc13821af9b21baddeb3d896. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16e519de-3bb5-42f0-92ed-f5ad63c749e1.json and https://artists.proofprofile.net/proofs/artist/16e519de-3bb5-42f0-92ed-f5ad63c749e1.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 0x5f48fa3622203a3c736a1b0be6f16cffe9908ac5d7b58f428dd53dc79893f93a. 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/QZK6P1930076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db790f9547e27ca154132b927ca74138b051bbe873dc7084144e0662ba6c38b. 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/QZHN82241803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x883d336be7bd08dce77ebe2aef91a0be981bb3195993639f9f6c280e4ddee047. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZK6L2250301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44737e7e2c039e03d14aaf3ae0158859a75ad94d7cc04f3b0261ffb1dc63128e. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZK6H2288894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e34daf93917193f03bb54775b6db98845e95cb0bedcdf39809d4fd530c1a977. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZK6H2242111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d4aa8600122f37cf6c0845106770421a421a61f80f2c0e95978f8704fc5972. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZTAS2241134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47571d1215563bf80459882845016edc3321eefca8c937e00d48701d75b72e4. 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/QZTAT2235212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d42878cb65d4ab3a788c2d9ec739a8cc431b1f0a1edf05a1d251f4e71df623. 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/QZTAW2209989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c88fd0614b8c8d26e87f8209fc7e6e34ae66ffc05b0ee387f4869f79b410b1e. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZTAW2287708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f63be032505a055a962167c8df386a0255d78e436b79e140f6cbe8d729b10d. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTAW2212143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf514c4bb18fe15c6d618c65d1707d053eb9f692ee5bbf0f783ab53515efa92. 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/QZTAW2214215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bc38faa4274351dedf167bc7d7aaa832058dbac0ba92b8e7f36235183796ad. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTAW2214218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3289e5cf6b9bf333c650de778f9ebd5fe17a86a258d56f6e06a99810600bc867. 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/QZTAW2214225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0fb2bf088e1d372cfcf62f244f6f52076312698dc7b4027cf897dcd4947695. 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/QZTAW2289725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86965a0f86a2aaf82acab54da8b5f0040a52d532fcf28faca9a58546490e92f6. 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/QZTAW2214232.