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 0x704c94f885c924f313c8bb7ccf8b5ea213ed2438ce044fbc355137a26039c649. 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/b71fd180-20f0-48fc-8735-555ce68b4ab1.json and https://artists.proofprofile.net/proofs/artist/b71fd180-20f0-48fc-8735-555ce68b4ab1.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 0x55fb6bba353c35a917c16bdadc0708ef2f7c6ab2a2ccc58ac483588168cf7a94. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNWT2266583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69662368b1e8deff0316db1e0bfe6c020bbeaa7fcec2b5d1629944fb2c3383b. 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/QZNWT2266584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46b2ba75c97fe1761dc9b6e2da062062d46d69f5ec04e63daf993465033a40c. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNWT2266586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e565f3b7362539486240eb90e6e3412a1be9b6bd2d48611c6326b7894943eb2. 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/QZNWU2204823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a72155f54a7da50cf7c3387db87ca2d1867cc00bd1050e5ee4d6a050654800. 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/QZNWU2204824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7fab6d84de180bd7320b123fc2e3c7c967ead4ac1ec9dbef08b0bdbc4a1ecc. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZNWS2272611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd8a43ae94e5b93cbb17239f460be5a13279808e3f2b56ab744eb38ca8bb318e. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZNWS2272613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42fc0ad379b797c685aa42711348abc0748e6b3cec19a7671f709d9f64b89f36. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/QZNWS2272615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6887fb6fa72b8c903b166d89070cc28bc9c787a6d74d23fa3fd10642b31fc186. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZNWS2272616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a18184d96b153574f93c610ba0f9852769ff148942854367f0499306ef83c2. 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/QZNWS2272617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x306cb626d20c683c95990e7b94b28577c071ff0c91e9e22f4171e03407e80991. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZNWS2272621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84406b787b5e4d2ab043f7ddcd97392a496a6ea8b7c4e231bd26c038de2c02d. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), 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/QZNWS2272622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0eaba2d85d899dea80170289461c054e10c746206b1c23a7a8490a4e0beef5e. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZNWS2272623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc5888d376c17f98fdce201b3c178fbd30e3366006307f17f43cd3beab53e64. 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/QZNWS2272624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a7330003e76e32ca04a8ed8e4c15b464fe6215a205ed7d34a3ba11d8bb35b2. 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/QZNWS2272625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7816228db004237553a532088eb62fde8c7dde6f103900efa33251e500ff70. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZNWS2272626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed6565bff8bd897d0a1f92b2cf7a65c8fcc33bfce7b53429d0a083e62bd9fad3. 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/QZNWS2272627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4f941c6271edcc893d452c2b70022359536eededb9c38b8b8227642f8fb3cf. 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/QZNWT2269160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a904a68acab02a5b2ab61541393102db3ea32bfbddfd77d68143da49e4497b. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNWT2269161.