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 0x081541704021229860d76239daf8c2fe154f6031134e5b84490fd3390f6965ce. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/008ec833-1969-48bc-b819-1bf7a066a533.json and https://artists.proofprofile.net/proofs/artist/008ec833-1969-48bc-b819-1bf7a066a533.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 0x85729f23526e9cb140d9bfb532da363b6b34bef13accca38e44b751b2e195fb0. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/PYC372200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77bbde723c4fbf1368e5ba99273c83949232cd9aaab4f02a67dc5a5d302b65ba. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/PYC372200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e829101732dd3f6766d6670b8f94ae49ac617759fcc5bc034e5ee8d4dbf4bec. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/PYC372200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f42f34cf8034ac25603b3cbd909e4d30831fbcf130a2107f27dffff0da15cfd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PYC372200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1fca40de7c4f2c1e6dcf0e1a63073d2ed13de1438a0882403c671c0ffe2a972. 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/PYC372200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b11d752dd6c537d7f1b8397ba4bd3152f9a7a4f6bcbf390ca6e5ec0791fd614. 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/PYC372200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8aa46b29294b3b929d77479694b56fed23869f3b351f18e396f009f8fe7a01. 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/PYC372200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ae138e796fee0a7ff2ee2a06c412c024afdd882a941c15590beb20f0665e11. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PYC372200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f82ba97a65af1a88f4d2e776c79829355c94a8288c8989a29abbe8ea62ce143. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/PYC372200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06eafc892947d31043a45628675af5f1663d7a4a88cd66a12d6626bb8eec7644. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/PYC371900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2a086c573eedcaf96e65254651e75f45041d8f7636e257492a7b374864b55e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/PYC371900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc879e902776dbdea7545244dcd9f81232ce5494f5173fbf70d3f1207b69f2b3a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PYC371900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d6687d45ab848111bc7c6c21b053f7f757522c511f10d18da73fe8b42c5521. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZWV32452603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091858d42c9d8ac4256f40666afb784f65f5823ee12cb61f61c9aa64826704b4. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USLZJ2154487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed55deabc94e9caeeddff869352befd7fc688319203ce30d9f64cf75336b6243. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZ5FN2139385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbee94b07de30d8024fce650700739449982e04b896e92f8185ca724d4759302. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZ5FN2113517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb23fae2da99c0f6203f4e34cc618a89cac828d23f0c26a95e4f013811df1ce. 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/QZ5FN2266485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5988e5431288e746ad613414597a14abaec9bd553ba849bc2531f866b2b34514. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GX63A2100004.