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 0x002e41b6c518cce3ce5a9e1a6da4a556a19aebc0c71c9f6523a7d5eb8dff288a. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23732571-d825-4cbe-a33b-7df6a897e372.json and https://artists.proofprofile.net/proofs/artist/23732571-d825-4cbe-a33b-7df6a897e372.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 0x3ca8c00cc1f6d6ba2380940007362acf2e5c4eb1fcbeb26e99278f2e17f7a606. 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/QZHN52508175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0074a4db9e197c3b9935c495abda817137beaf1bb216846b3b2266fd8fd26c35. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZK6N2588486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923e589f1f038fff5adfe0e12a9fe3e513ec4c1691bd44facdb6062917307ad5. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZK6N2588487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc956e448f1ca2116481ef2c32cef9771011d9402f7794cf237df68c3265872. 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/QZK6N2588488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3bb1f604fe48733cc02c30c0ec27c22b2cd6720986d5ffd37b1d51258fbe82. 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/QZK6N2588489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9b70f1147bf13d2864b45dda5608edc32c4222cdd1d2c44f880209563de394. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6N2588490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9919e1e87ec2142d8562df94a85a3cb7db7351a9801367f94889d69b06486b2. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZK6N2588491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa45dccb7601f21aa82d9a9e8b7a1e00cfd55e3fb278aae4fc5af4f0690a6ad76. 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/QZK6N2588493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18adbb9a3e80dbe7dbe4a9f82fde7bdbed1cadfcc6b9d5725b894482aa41d78d. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZK6N2588494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812c420aa1cbfeff7e552d4a29b6cbfb135c1116d3041025a7f6aba059dd1443. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZK6N2588495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bdfcfd7a1793ec2650de709ac9553b8cd67a90a46a4cecec4c43b8e2032112. 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/QZK6N2588496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd10804eccb5d0a02b24d08813769e406fed2ffc51915f098fb527f68e94884d. 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/QZK6F2536124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf40666060d6b89732d68aeb07b42d3356f9e8843eb097d43b636193ee9ebb149. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZK6F2585777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a4f6926517679f9c8197e07ff28b13d5d775649c5d75dc7ca33590457adaeb. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZK6H2588454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11273d64d423873a27083f96aefc728230fd8f6b2e257dff305a9e608fbe35e2. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/TCAJA2436890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf7592b2b9bede7167795b63ff8adeffcc4bebfce0e8ca80f496f3e6dd25751. 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/QZHNC2414192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7217368486a6a639e053b80784fd12549033c3ee721e694467a7716ca38630. 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/QZVEM2570790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa97ee92fea072e24c58ccf4b1fc5cf656019b31762bb3d1634f315f9c425d26c. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZVEM2570791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174d04a3639556ff17ca4fc107ed24b2a8ace2fa27749bb1f0e4949ecf2d4ca2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAIL2468400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1672c782ef788761ec7cb23260a61586b0a547c0102e6948a1ad757be3f760f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7Q2555417.