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 0x757413ca99f1afc5b8d6728c11eecb41a792a5c94083d387f284aa41de05bc2f. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/457fdf26-ad8a-4930-becb-a22d55c53765.json and https://artists.proofprofile.net/proofs/artist/457fdf26-ad8a-4930-becb-a22d55c53765.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 0x803c345e9d56c80f925798a3e13b8632d558c28450cc07d6a88bad5d6c6cee94. 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/QZNWQ2011304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fa900bfaf5a1e1477b94c6be7c926f78289d823dba5f96d8b6e89c7e3ce05b. 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/QZNWQ2011306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b301f1181a5cce18b03348730fd724d96074e9dd0ed8bdccda7bd4d3257f1a. 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/QZNWQ2011307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e0c3dd21ef06a2c5d446d17da147c90a9107e4b1f4f77e35a89170725124f6. 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/QZNWQ2011308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341ef6057d05ba43461ef0be770bcb8b8807a074e5a3ea7ed55e19520eeb61d2. 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/QZNWQ2011309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165901f7c6599e96118106fdb3204bb48078d60d8518cba190ac51ec55f9844c. 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/QZNWQ2011310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbaac05712258b8a87b6aa07bd7ea24901d8561a0f565932a8b1c36d529b3a6c. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZNWQ2011311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x436e3b8f4f0742211aff0c1d4c674da828d3359f255a0cd1b965fde64190f18c. 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/QZNWQ2011312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07ce27cefbdbfb77729bce031a75ee5f5e7966e9e78defca425986c7edac37b. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWQ2011313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b87e2aa8ac7958203429431f68da1a2eb44272a46f487ab88b52f55c15815d. 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/QZNWQ2011314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c240968bc37c940b828936aba24180b869ed1cb43682461f37cf912ee4432d. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZNWQ2011315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30ab0b0336ee59a78457aa57748953a1882c7b6b3a6a74bc6e4771062102590. 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/QZHN92507286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e4723d18a4fdb1640e75afa6a2f46bf072c8af5852122f2cb9e249ea26cb60. 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/QZK6P2532488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ba4b71a61844d22e57ff64926a08d79a3f7434341083d32a111d536c3b08ea. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZK6P2528260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fc840d769e159c7b108ddb01d7dc6ab7901365f29130fd61b394271b6773e7. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZK6P2530140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb684c13789ec32b7c9b499a490b7b7a8acc172bd663e1b08ffe95f6a69f6cb. 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/QZK6P2530216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8dcfce972539260ad7d51b0ad14993331efe89e5aff2d27e18f398daeb1d8e4. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/QZK6P2530233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd9bdb05d9428eb8756ec78400c0f5666642c5990a7d8eb4d6e99f093a08e81. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZK6P2530263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f097a8038267e9894d2b1f0eeb53b8ac28271c2ce4b3c3f845c7b12421d067e. 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/QZK6P2532430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86da4f40a91012bfd84e56090b0d82ad7fa06f7173dcc62832e033e8a4a1ad6. 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/QZK6P2532465.