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 0xb6d7e7a2223963902d0f5c586b5af1ce24343a538060147f7d1f905b532295b5. 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/e2ce0ed5-b81b-4c1d-adf4-8c2281384fc7.json and https://artists.proofprofile.net/proofs/artist/e2ce0ed5-b81b-4c1d-adf4-8c2281384fc7.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 0x5fe384d1164e5aedc2da0f3dd7648fb25d6107f657a71754888d49693a82b1f0. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/QZNJV2549635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654dfdebdaedacf963cca672e55eb6ce8c0e446e1577f4f5564686b8d8564040. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZMZ92527003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7cf1ce87d3f4b7d8fbf544d01610fd57f940c81dddfb647f1d347b5113a7c39. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZGLM2596026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0c509b82478a7fd5f9b8224c44c1965da576ab5205859c43edcd9dd7291d17. 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/QZGLS2502778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b61a482f1b0d9f5fd188d5414deea0db05bc2eda4a52f8fca544b41b1d35faa. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZGLS2502781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca1d83a45dd5612e10bb1e0191e5d340dd2d1e2daf68a1b13ae2bba35f72b79. 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/QZGLS2502783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1f9e66de8b54eb253121b326163378e17f5a68372dba21d30a9538ed5f3f87. 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/QZNJV2549666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb333bae97d59c04925928c547b2a62132b5397d1ac8ff7469260bcfd4a4db164. 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/QZGLS2552238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b5a2f9e47ecb1175b6e1f6cf0c3223d5f14b648d58a1eab8782f14f922d1ba. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZGLS2552242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbf7ca4a708d1ed520e44945128bc18f59e0beefe0dcf9d36f68413444907022. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZGLS2552244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65591ed6010a825ce3400f579383b740497aeb4fbf16e97e484bdea6cee6ae7a. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZGLS2550634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c3b60a15cf6fd0bb38b55ee9799bf4e419e7a6e98bfb5e262cc5fa91245368. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZGLS2550636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7928ab18b93ba79691d2878dd1e38ae0d546f56d64a48d4c16951275f75d207. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZGLS2550639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52106bb7aa10eec3fc7a44849401be5b3ae09c1a4eb14126c84d14a07d84f87. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/QZGLS2550641.