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 0x835d3c0614650a6217b9931c82c32d02550ee31d000b9f970f8154586506de2c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c237866-5231-4c15-8c3f-01ef4bb2383e.json and https://artists.proofprofile.net/proofs/artist/5c237866-5231-4c15-8c3f-01ef4bb2383e.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 0x900f8e283186c43f959d3922e5a32362dad028667c74453dbdcd8735e6c37410. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/QZRP52563307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3db351c19a29f488a521e922228261d53cf30c53e4c9c64b53fcd7963a95c7. 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/QZTAZ2510869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf144f1c0126a5a6ab75869fa326c9d2390c39f11893542b407af18c76ef7d1ec. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZTAZ2510874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4d5cc5be394091e107a49ae02157e785491a05c4cd83cb09cd15329557d221. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/QZTAZ2510880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98485b29b4cb7ec9e3ec79451181ac1d712524d1117c7c055e5c872508e2254c. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZTAZ2510889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3f1071cd28280a52430faead9920acadb1fb507c4565811adbf882ecff1f2f. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZTBD2530321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a888f6f60948613197c144f5334cc6ff33b5b9e2d855571d5153147a0071238. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTBD2530325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5878a4f37616f6c796ffd61b9c384ab50f54dd2d0d64df2c9abdab41e733407. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTBD2530326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d31cfa67fe66fefc7a601946fcc851da4a04b1eba2f472dfee17e6e2d940064. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZWFR2518400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10faf94498aff1cc275d23b4353ed80adec202cc35062b31793e0933da8e8521. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZWFR2518439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fb12da8ee8aa460f7be7f6819326e3d41b6a3f9ecdc67ed6180075990610ce. 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/QZWFR2518482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96bf024a41d821f8fd08ce2fda0e0e4f08ec81e501ca5345b56bb62e0b323b6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7T2527532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ab449d786921c406327df0e4ce6c7b140e4b2434c08e4dc75921bdaaafb063. 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/QZZ7T2531079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f313bc50a883d23cdb69690face5bec14e03093db9f510b9feb461574e7cb0f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ7T2527535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb119805a17dd395eaac21d9d95c873fb70b289b4a04a471bbd1019868dd9dbe3. 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/QZZ7T2528524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2641d85772d3656fef9f21d7e65a1f8af8d7dfe42569b6d188bc776017d57a01. 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/QZZ7T2531084.