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 0x5e1c42e41a30143bb9190d9f2ea4af7dcf7502e21310ea16186a4adea6b9f8a8. 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/009fe626-d692-4bab-895d-494b1ac748d4.json and https://artists.proofprofile.net/proofs/artist/009fe626-d692-4bab-895d-494b1ac748d4.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 0x9fb320324d188458621a294eef550b075f7611d63d6722e9b2878d59a1f9491a. 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/QZTAS2469901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b1f850845f40e78e66469bc477e620ee121b990f89615900335836395c39bf. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTAS2485585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1734c46b32b254a05139c4ce8ecd374986ebd2f04866867d3708890844d9956. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZTAW2494226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0cc1e95d13f740a48d25d462404f6efe71f7780cd985cf366014e50dab4636. 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/QZTBE2445582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688e4021bb8b2441f08ca58e6d32e3820781745020c919ab74acf7b6bce0bdf5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZWFX2456760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaae55dfcbd3e4d5745170b0d134040d527a838b5daf85bd2cbba4ad301c483e. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZFYX2528880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264ea864a67303ac96c3d9d38070099099d586c4cb47cd7595e037ad16eccddb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZFYZ2527175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabc1f74619a8b10a20011488ffac58922a4e225722339ef6c95e847cdfda4db. 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/QZHN42588687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94c58977ffc66a8619e49dc2ee96e249ebd624d36bcb7f02343d90603a9b901. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZHN92532746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a236e1d0a6fe0ccfabb28b26b1ba6a06bd2a99fef2233b09e6f79c1781e5b31. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZHNC2579919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045905f82a9423a1a7b69c0a61994a9f25fb9dac0ad9c188598263c5866344af. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZK6F2507826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee695da943d34027dad768d63e91c9820d74fa034c547f5897094056c023bfa. 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/QZK6F2554831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec95e052251fa52c00aa60d4f6730e561056475e80bfe407fe5ec7e30401dbf. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZRP42551557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2c571a00e24b1a807727c5cd94cfb48033993a6efbb4c6385c03f122cad72c. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTAS2581855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ef6e5bf3d54863998bbbe56df441d0d046f677e08dbcc71b5e3f0f6c18eb50. 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/QT3F72578698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b23f8000b06357d67aefb65af6290870364e48e8d9d8fb6575b9640ac7b7f0f. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QT3F72580655.