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 0xd768c9deed8ad6e27e98ea6d1d23274a9e3927be663d63f8ac5289fb391e473d. 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/db188de3-d9e0-4636-a543-013134253b68.json and https://artists.proofprofile.net/proofs/artist/db188de3-d9e0-4636-a543-013134253b68.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 0x04ab10313e4f441101e355d53dcea36702a7b2abf2525e4d0efb9f6be16ba28b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USCGJ2398509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149411d3840583c3d1f00def59fbe25aa3afddd4f4911c3d8f8bc41e56ab3642. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/USCGJ2398510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0f6aadc8e2e28a6f6a936f1336c737f4b288e848012a2f28ebcd74d99b0c01. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCGJ2398512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227dd49dd3782448274b7abecbaa181cd85cf1b8ba888f25413c6e2835354a0d. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/USCGJ2395580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb52173bc8d17e19740cbc38eae4ae3796dac778779f1c77944a13e36b1a0257. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGJ2395583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec17b61eb397756933de2dd979cd0f1e4109320f2d28eefa3a9a52c25f96152. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USCGJ2395588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee0a34bc0abc0c9be6c13494a7d20524cb4c4c00c3b6feb501ac0ba911823a1. 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/USCGJ2398572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa49ef8c376cdd7b87b5767cd1b59456da4eee2efe43d9920ddd67f8e45c254f2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGJ2398580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68eaae7e2db2d52809d705d433885e636266c2787546ddd70809fc49d161a40c. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USDY42322984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f759d9d39b1fd00ba4c03bd9b98cac1f9e31baa2dba8a51f0a3c100429c200. 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/USDY42302437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b1a4f9946571c25c2e8a0d9b255c3a89106e72a58703e026568007ffb0a00a. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMZW62200372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16b24dbff04b4c3dd0366e7b6399b6a27fbdfb8479e03024cd9034642c5fe69. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QMZW62200376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9fff8975fe0b2e39c4a2973a988073d73045c6dcea680f3e2418bda7446774a. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QMZW62200377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8cad0d14892f17aa2cedd14091fd007576186a5e5e65ef5b0a6aaa2337597e. 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/QMZW62200378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de66fe3c9cac7326e5f869601c4023ae0f6c077abc2406c5fdfb6283158c46a. 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/QMZW62200380.