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 0xa2d882253ea6901109d0a92401f6da38b3b67ad7d78c27ada4977e6ef00f95e4. 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/8c1099da-f2e2-42c8-af4d-2578b65cd63b.json and https://artists.proofprofile.net/proofs/artist/8c1099da-f2e2-42c8-af4d-2578b65cd63b.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 0x745cf1b36be13cfde5e4c34fe7b5ffd34e6cbdf9f118e09de49e5389bd72b58a. 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/DEBL61165653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe96d7ad461196c3fcb4fcc67988b5dc1cf0c655db17482506495259e2a1e48. 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/DEBL61165654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d3c9eef1e04bb3ef875c5ada15163192660876e3f2a67174de58bb7381a6d9. 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/DEBL61165656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbcce585a8efb8047f683d32063211a5bec57e6e54530078e9876bf2c1075d1. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/DEBL61165658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b15a827dfab355fdf790b4c6a62ebc73f2020274581d15b3b13b41bd91df69. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/DEBL61165660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab224354b46df0bdef4cc00864d3cf8639682d3a3f0c46ba5a81225b559f739. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZES72551549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853c0d2bb2c1fdfee4b45b850ab06ede78dbaf71883ef17fc19fbeb216b391e0. 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/QZHN72573259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614635a472880a53730521f25b6cbc496c42adbd1aa680f0616285a92d308e8c. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZHN72573260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256cf6acb48d87b1c73c37c08d23857e82275dd3ce1cb689693a384598dac4e3. 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/QZHN72573261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0debcc8fd003859b974c4981c4989cc51bebf4f4d564566cb6738ed68cb95157. 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/QZHN72573263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bef2bafa305fdf575e388205e10b4718c49216a54a5f134047176694a0278b. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZHN72573264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed4ef68aa2587c4d0f882446a826c0804ef870e0b312d7a1a5bb141f16d00c0. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHN72573265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3817e31bebd63267d83192450b1a6ec441fbf759cd92c4380f4b2cc40288db. 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/QZHN72573266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a2fb1dcbc2a6809d846fb1a1aec04bc1c5593753e18bf920e7917216a5e905. 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/QZHN72573268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b3792f5b7efef300f04781062f134312c11a62a57133b8f547c6fa1ca7f322. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US25T0410025.