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 0x613bd9f962f2f44e4d356bd48e8846c14af389e80c1f76255271c0582df86385. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00cc4763-6be0-4637-bab8-3f2a941ed8b7.json and https://artists.proofprofile.net/proofs/artist/00cc4763-6be0-4637-bab8-3f2a941ed8b7.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 0x5370a97816a6a27cd5638ef694d3baa69a22abcd9165dd269ba2eb3ffd8ee102. 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/QZZ762592033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546c47c63d0eb514096eaa00e4147f9d30391c95c4246f120d4248237625776b. 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/QZZ762592034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea6ec6bb7c6da9c33b06d66649d2048e62dc2d5dd8e7d0adcb88ca48c857a1a3. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZZ762592035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ff3dfaf8ac6f627587765d95a659bbc010940ce22ad8016c2bd377d6b66195. 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/QZZ762592036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1fd94549dcabf16552553187ae7e7ddd7840fa960ce90e647547d80f92d000. 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/QZZ762592037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ee30f3e5d5756e9a2ef26f46b2a247d7550a65cdee419902fafea8654b410d. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZZ762592038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7352a9c7e5bd326e187ac5527ac4aac85286b2f96dd6212694eb2323ce3e6511. 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/QZZ762592039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93416ab6e303b2eee1588ed327b78bb83e702a43cdbec642eef995dd550d4a5b. 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/QZZ762592040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e23109051bdef457539ac60966de7cd82dfb09f96687802d400cedc7519d293. 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/QZZ762592041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba6e5b407fa8c643809458e5a7cad7063de617d06bfe7a3cf3a7abc42f83654. 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/QZZ762592042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff53dfde887e9f1a6ba53ad473fc2be6da9b7e2a7f7e5fba451bcdce68e3e6fd. 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/QZZ762592043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0dd442b114a06e4eb80d47b019ba9951590bf42da20c58765af3c60d255830. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZZ762592044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd705240080fd85a5da8967f4b21f13315d66207c47a05aa9fe288eb90f4152. 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/QZZ762592045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9de080b3e447e25011a6d2f4ecb142ff2f33b108180a214bccfa0116ee95aa. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZZ762592046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ed155b916e01c6be91bae23b4927b4835766aaa3e3e4274a0a669e6660f71a. 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/QZZ762592047.