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 0xf79943336e9690b21b26bc44e2953bcf28a756f243a26841809a8c14a656ce85. Chain 2 (Bitcoin): anchored in block 953599 (2026-06-14T06:43:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e6c6f4a-bc1e-4931-b4e1-1664836549dc.json and https://artists.proofprofile.net/proofs/artist/0e6c6f4a-bc1e-4931-b4e1-1664836549dc.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 0x2a4bdda5eaba63d2c1ac43e28cf2893b0b11ca21cc87ab88ad153e2c67d5abdf. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZHN42050662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c64b7f176dad715e8913da9c140b553e5f79ddd4b261eac0b765654d8de2866. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZRP42144286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172f14b214a855cfc1c7649aecb709757762f3d10a121b671c2ad438077aa71c. 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/QZFYY2290139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40cb579364eb6a3a893a2a5a61dc86e8e73cc1e157ff23861a0f1b05cdc86281. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZFYY2290140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf608b2671c2dab23e04c54f87a188a1d5a2b78b275631195dbec88885480010a. 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/QZPLR2112177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75ac2c980018504bc7de137eae6f4463c583140d85b09fe44aeedbcf510b38f. 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/QZFYY2290145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8351a19148fdfefb7bec24ea911ba677ba4c4d533877be7cf5bcc52e35626c. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZMER2252199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8133a2d311986c76d4be3af9f62d4dcb5997d0dc74f8c668644476f3fb21ff8b. 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/QZNWU2298272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1943c7012622836e02222bdf3b422a8d2911037d33ae9d5e6b78969a35b95ba0. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZPLS2217412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33680e3cf94a1d39c120c5b4b36db61eca606381dad9377418381293e93d73c0. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6F2392545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b11da13d7a6d08e023f88da00df158b2b0d0afc7a66aaf8e17eaa2e83e4130. 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/QZNWW2340920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e680111ca2b610c5194eb464193bec92dc787807646b619fe876cc6a3d67f9. 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/QZTAU2382380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3772ed9440363fe621d8d8344a0d542e2ec63e5eaeb1852757bcc4397830b2. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZTB62328261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93defc13b248e7b7db56c0d2fc61942a21536f470e91e0eacc5790b6c20ab150. 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/QZK6P2492545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcecb1bd9072b692c592b4a56ad8191869030cfb5dc93529b6875c9f3397ad278. 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/QZTBF2422052.