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 0x509d1036727db7dbf9371792064dcc5aacc3cdffc881c0372d218e6144829086. 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/4087e7c7-3f1e-4583-8c22-97808a6f1e96.json and https://artists.proofprofile.net/proofs/artist/4087e7c7-3f1e-4583-8c22-97808a6f1e96.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 0x4afda4e700f17dbd7bc72756139a0d35454b1d1c6651e6b1bcccb9109e38c50a. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZNWR2145767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97635ea273942f86eee258931b99c55e04b7427766745ab40208386c0708c33. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZFYX2284210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2619b5fbc1b2fcd5e71d626cab9fb146ddf74f39fa0eeaadb8017bfa4b85593a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZDA82288380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ecc7755d3359967e1308a3393cb3410d3060eb3b0f72d7417afb6c393021ff2. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:25:08Z), 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/QZES92217742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774abb9a5fb9cf9a09480bb50d08c54a1b75c023af081289205a58cca98cd41d. 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/QZHN72237683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b844b712854ac49361fcf10299e0326a5fd205cdc9c8dd7c896486d9da6e444. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZPLR2242418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747ef0f82ae370ee62fdb09be22e267373a9ac01dbd8e28264c8bb90c58f6a37. 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/QZFYX2346036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc818557dbe92ec22e89a2fe1f1bc70fd3725036b5ab9917d34a2227ba8ef4a27. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZFZ42349688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4501dd3c12163095b5493163e79b1000150e8382146eabd9d7310f9bd82329. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZWFQ2381861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b417021494bface94c63b35fa848799f93e8564018f9d71482e6b0c55a6e60c. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:06:23Z), 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/QZWFQ2381867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f51b21ccbac8aa5338f79f14212753e621b1c895a9f77c8a8366774b51576dd. 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/CZUM72401282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebbc721d3084b66d7baf1571d315df309465b59134f2a68595a5aaa1c2a5da6d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CZUM72401283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4845d6fa84870dbb4354f3a3d0c1f11585563a28d746bd2e2416fb6b8ac160. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/CZUM72401284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9879e7114a6927ab6c78b6114de7dd1d74d0fdfdf381fa5aca765ec20c56a003. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CZUM72401285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84bfb758012dcc576a958304cd87cc059b4bd8c6be55fe1995f6ef3fc6b7891. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/CZUM72401286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4bcec0f17bdd7ace382dc96b0cc6a331088d5a19a5ac3fb7d6a533b3b1332f8. 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/CZUM72500487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b78fa00f42ff8d19749f87fac79983f1dcf96b9ab6fc4c0111bf0e692c888f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T09:43:03Z), 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/QT3F92589681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40093e584742b3f415ee57796f560d92bc17e47c55ff86155b902423e7e6cfe. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QT3FG2524925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07cf5fb7548d422c327607f959bf202418d92f7ef1813b28c8c8d0063ffc2811. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZUM72400463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a8c0eb00684fc9ecf4b5e2dc7d495e3fce8084f220feeb08d0dc3e12af0000. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CZUM72400451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ad87ee2e06aa6b77d633c58f00a92ba8d6d36fc48d4b58fe470b33ede7fd3b. 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/CZUM72400615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7258abde2917ef224f2b1fee0d925fe5485648a12a099fbb7c9477a5b13a1efa. 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/QT3F42450432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a33f41bd1012729049289ab0a47c3606427f4afbefda43c913a5ac9234ed643. 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/CZUM72400670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85b65ee10735ff3e33ee28fb08679de8548d5982fea7a1b1e2bbbf8c5b58b95. 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/QZN882577595.