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 0x2ddcc41f262af82ff05c6900d417005490e7e43dd181d25024b34b53144cb940. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b3164dff-d257-43f1-9b4c-323528ad413f.json and https://artists.proofprofile.net/proofs/artist/b3164dff-d257-43f1-9b4c-323528ad413f.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 0x6e348cdb7cfd1e96e75a67552180dacdb1c36c8ce7f12a88826d2fb54a196a0f. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/HKG732315294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa8e2e1a33f9dbdba88ce6e8cba4eb8f2554356b8fc862fd489585a63e83b670. Chain 2 (Bitcoin): anchored in block 957246 (2026-07-09T01:49:50Z), 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/HKG731771028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c9ccad42ae61e991ff3ee58f3e60e19a9f0340830d14d5738299aa2843561a. 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/HKG732200216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f70eb2ec71a1177c950dadbb83490fee0650ac2b213dd54999f78e17271485. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/HKG732149171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b6677ff6ccb18d07b929f70855527a0e95467fc1ef5cb3fa681f7d1e42c47a. 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/FRS182134458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6f7d5c651c95c479e0402b0ea7e2ae0d4f55aec216944a839f5e8d4f3cb327d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/HKG732149022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b232640aa717749898e495a4eb00fbae9b131a22a53a2c3c4223c0da0c24faf. 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/HKG732128857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bdd5077155f27545946acbbe999a18912691dfa3c89ef277bd76c8fe363f747. 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/CNZ632100498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3110905337866a5683942740f464bbb4b573a5bf5e4bf98736ff932acea8257. 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/FR26V2090716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4f0e511dfbce335e117d6e70ceafc0ead1d8b538446d37fdf497e8f3468b1f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKG732041315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d13530e5ec8783e5f1068ab78bf10e051d81ca7ef4ca691d1ddea45f08a59ac. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/HKG732013386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf135d82ab4cebf0fdfe8f9a2071f750643aa6f4024420ce76cccf32c33bda86. 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/HKG732118752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9215c46d05b386f1665356ff0835d8d3a41b755fbc4c2851d1c656017aedc0a4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/HKG732015322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac83adf2a4d96350e0b400dde42708b012ad6ccd8dedfde1f2331e1bd3e83e6. 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/FR96X2198942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43136dee7948ea56b06bd8ebcbf6b3fcb495754d605d537c9ef0b7fc9f920beb. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/FR96X2198943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271cd292fb7d7e011a3b78771163304033bd51e1c3f73c8e6f847ccf693d4302. 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/FR96X2198944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9930e434fa0e1b58b37a53bb935f3f5194cec3f442c5547da0b29638c64f98. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FR96X2198945.