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 0x189bc956697d7ba1b56c10426c05b1b9f367671a52c326336da6451fe68d2c79. 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/7d3daca7-64e8-4915-be4f-0c6bdece7ce4.json and https://artists.proofprofile.net/proofs/artist/7d3daca7-64e8-4915-be4f-0c6bdece7ce4.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 0x9373c2d94f0e597ef913c86d6ddf41f85835b4619c78468336c42aceadb0edcb. 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/USDY41957580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a03eb1c2295d4bb9e4c6218bdd0ec26a5d32cf0b91bb7e93a57f0ae353983d8. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USDY41957582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1830cb7e1591ef4a04b0deb1ab2d995b8e54484a2ee4d543d73987b974161783. 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/USDY41957484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d5061af69b515ded0b71746e92dfa5e14b5c03f91d66d500a28c8ae33804d4. 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/USDY41957502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44b14a75b228ab82cffcea0ed19702107ede004573f65ede416e602fd63f708. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/USDY41957552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1072ef5a6a8880b4dcad51f9772ec9bd75e07901ff4a17a7af01d25f35e01531. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/USDY41957568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02678ed4e1276582c5ea3b97d2fe176def3f86b3cfd87ec16a8f0117ba9174da. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/USDY41957589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbd50679e24d5a5c0e8669c2c1c0eaaf1c7d87ec75c103f9ffab2cf6d073e76. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USDY41957516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d518e7346273cf7d8b82d10269a19c7ebbcd2ba9d3c499d501a4257d4ade9f. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USDY41957517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65619849c228fb3c02d2f3e6d4d58b5cc0e4aedd1055594715c8a5b54e4d9151. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USDY41957521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1ec2523952abd7999fe8e0c995b73220edbb4e7de21f50ffa6e43776a59c64. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USDY41957523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df347bf8bf1890c9351622a197a7464937a4bdfbe50cfeb88075aadc14ce166. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USDY41957545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c28304f9880aa3d12bfdfd8b6dfd2b88ba3b706a550455b2e364c15bbd383a8. 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/USDY41957547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf23855ac5ff39a138de266858e6de0d54404bc328e80b852143a825debc8be52. 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/USL4Q2178225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6435abf1f654f3adda34aa23a1e0e878153055ccc9bf5f3373c46f8e11b773. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USL4Q2178226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8413a87b33f5585c6a35df33b5fa6900491e207b5254c081c18fb15394b2653. 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/USL4Q2178230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47552b39274064f97675bdd3531724f0460820a4b60dfde21218e2411d1e3e43. 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/USL4Q2178237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005c07497061c34a0f8e3f2c95526841997a644978db2ee8fc2512cd72a56f45. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USL4Q2178240.