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 0x5de87a5c9f697eb4211b3ea07d0b4a7aa739628a0739bc272ba94b60e9810884. Chain 2 (Bitcoin): anchored in block 954013 (2026-06-16T22:27:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34b20bd0-14ce-4cdd-b998-08fc985e255f.json and https://artists.proofprofile.net/proofs/artist/34b20bd0-14ce-4cdd-b998-08fc985e255f.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 0x296af73f5511645f97f463502721df94f87f8adb288168fc8d210ed68ad55d66. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFZ22532059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1486179f48bf1fcbe1ecfacfd9e4a6592baff6a06b219a4d1fedf447fd6528fc. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZZ7L2442614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d541c42c5bd25fff83160c47120f868e0b24570b53cf6211dd3051b3ea8c225. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZZ7L2442615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4578b0b2312c712816a6e1d0b89af4ec34c396fb5c67339a712cb28773142476. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZZ7L2442616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0da083a635e220d79b859e037b3e5b69c09a34b9f71c1d02c60f4ac80480715. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZZ7L2442617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853d78a744ff0ec23ba2cf4dc6a0f32670a7388820725c005f3100388e5dcb02. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZWFQ2439416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a58569de1117b5c5b77b12f5e1d8e4170a4d1d3bfd53be3d3d7bc0221778cc1. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZWFE2325038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3724d6bf6da0bfd39dcb3f75573399c2c92233092b4e61bb7df558be2b030c89. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QZWFE2325039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b2e88ceb57aef162c634e6d0e064a8c9b7dac490565bc92bf62f9fa76f721e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZWFE2325040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c67da6816e5ccf9c401f12b229f30d2f64e2977dcece727d1cbe81c5310000. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZWFE2325041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc825ba442bb3fb403f301e7b0595cd577a17e15eb97844f4b2a303c502c69b9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZWFE2325042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab068959ace529856fc96c50c3d72ca27db90b664b162561b159e783a959f9b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZES72300785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e1de955686d1a94fd78dbf87dddbad0a696c03772518ea3d805294b794aae8. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZTAT2194733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f33b2af822116a0d0d2def49daf34103bb79fa93e08c396620f7cb5be7694f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZNJZ2316609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679ae3b99a5f384a18e679f51bed9f9ec6ecefc5ef12febafba21f6c9c2996a8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGLS2356097.