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 0x7bc2f3fbe20d23caec016db2dda2c164e6073ace23ac6297b3e4e9e6d34aaa3d. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ef78a7a-c23d-41c1-92f3-31da455c715f.json and https://artists.proofprofile.net/proofs/artist/9ef78a7a-c23d-41c1-92f3-31da455c715f.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 0xfdb5c51afa3340f492ebebcedb9d8426641f131c670164d109056198f796da40. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZS652201177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164fe5f6ee5f45e675e20dd9af3fa51bb762f0e36ccf7282521d5e3c5ba94ed9. 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/QZMHP2433133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368bd5fee6ac6c56ff8d6aa508eb61ccd9a9118820f7a20301906e37e5e6e797. 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/QZMHK2412902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa937554c537bed6856ae63a9695743e0bfe37491fa6c08640abbbe1b5073d3. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZMHM2456821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8078592999a60d0161893ab7a6550ec1ee71ecf406cf7dae7c8c23a9b0d6e67. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZMHK2439652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c937e366db4c19d4b36d34857b1ecd6a5698f33cc45eaca02250c7375cc48d. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QM42K2599467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484bfa96c04e9e3ab3b3bf2d2a17fe8ec169a99bc06c8e40fefdcd40eee26415. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/ITZRF2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2582536587ea25120c291e00bea262d8e8e161105ef44fa6b9c86e9f47eb0d27. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/ITZRF2500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a0115815e8b2b22e18e1179c2b729245d50cb2e2878456e9990a7ce7fe4a188. 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/QZMHL2502814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7421f2fe3b131d783f465fa456124f83fa846c24483b704721d5ba2e604231. 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/QZS642409973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee68edd518432dc8f35887b0cd9999303a2612f780adaeba5068835d4f8c6da6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ITZRF2500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8c9c8b71ea475838081526ab48d12dcf24d5c0887525f6719727a47bd2a248. 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/ITZRF2500060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf742a43f21a5409cd1b6f05ab06df05106b942e6f92bda5aeeda9086fac8b43. 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/QZWDW2588850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c13f76c7b2e09d513ea5f2f44fddea49b0785bd83a9905cdcf789ced3f3a55. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZYFZ2507997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x405921d5b64bf1b8f77226b6b08a5e29c354dd722f5a6367328faff7467429d3. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZTBA2437948.