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 0x515cb2964ec022bec23d4783b26fdb99d957815346606a96970686c7c63685f3. 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/291146d7-a625-4a79-b40c-28bcff7716bd.json and https://artists.proofprofile.net/proofs/artist/291146d7-a625-4a79-b40c-28bcff7716bd.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 0x0efcd3cf419a4fb2d71ba20dbd56075022aca6fca5bf21ee117e9fd9d4dea040. 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/SKP592100060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ecb2d847fe6f877c03e185a6514788dd5f8f5d20360a296a09a5b0043786bd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/SKP592100100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23f1bf1656fdf560d8800b222c9011dc7650b9291da1b8b9b384d63a8bfd06d. 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/SKP592100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d31bd2f0939ab1be15784a6603c6b2ea9555e3c85350fe2e267ed53536a10f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SKP592100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e6a17d96f8e605175236b9022edbd73f81dc69cc0d178d97fa2ebf2986394b9. 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/SKP592100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a482ec14f13afccf21753ceb37c669f811d69bff061368ae567debede8e83ab. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SKP592100104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6626c8368d9541313ef849b926c52a27d0d5519547587e13b18c57930288d5e2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/SKP592100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59e21bb00ed29aa0337ee67e0cbb6cd3cdc00628d27e5f17994a0dcb91dc658. 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/SKP592100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f37b4883a2c9b2f68cd314a8ea75d6c8f81f59767f16b5c2d3e8591e277467. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SKP592100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf18d0640e9c2a3d06c659b470733fd723b69236fb504d0bee3dbf418b4d352. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/SKP592100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7aedaf120403cc1647d46aa3eea1caae15b6972840d1874c59b330ab06bd6b. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/SKP592200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc537948cef9866a61392edb60cbb23080004bc7593db0e0262810f8e2ae0bb92. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZZ662309031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fa99b229128c48054c29a344eaee19c1f1c816b3e9032603db56a549a0a554. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWDW2444665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e31b958ca0ba353b9039386fe3643674fa1767bcb8648e9b7dab4afe30deb6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWDW2493011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa91ef8147bc8c93e58c544b7484cc4c313f0e1577606f0fefab4e40a1133cd. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZN882580308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7ac4f16e4eca5012b23b7029530dc0abe31458e07257ce34d74cd19d38e287. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZN882580310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb32cc22a614383b2f6fc27c120af8ef52a41baabbbd3d7290302c3556149e32. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZN882580312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7205a7d2ae5df5e44bdd1a02ec956e96f37fa4611e8d7087d7e953295f1217e. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZN882580314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bab8e19f637a2a0abffcb4982215ac5257cf13d2bfc5226d0ca4e25dfcd1d2d. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZN882580317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d26d8f17ca893c88212f70f1ff0992659d4f3d13e263011fc398fc294b091b1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZN882580318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x027f0cea115560728d5d424b45fb69436dd42e91bb6104be425f4ace4eac85a7. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZN882580319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c024f3af2f81da0ea057f6440ce4d81959bb536d530567efeacb8ef5faed43. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/SKA012300345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb567a495c8965cbe4b70f36fa0787d5f926e414fc9de9406b56b8439d2ccd2f4. 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/QZWDW2218454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7a799e5aac10bff0eef867719b6b16453019ef9fd3a57f42a03f09811f119f. 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/QZWDW2218460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214fb0a253b15318bc2f79d3c761ea6101695863f8862063761521475748f963. 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/QZYFZ2369539.