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 0x91848a3fa4fce7ffc871afc3fb7f6c88560fd347875d73cfb7bac12cc9c1405e. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/97b3e9a2-1d47-46c2-ad4c-13be037d73ca.json and https://artists.proofprofile.net/proofs/artist/97b3e9a2-1d47-46c2-ad4c-13be037d73ca.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 0x05ccaf2fc0077f2f13e89a231557c2c0e9ad6041f17e5b8b15d20cb5bf33dd1a. Chain 2 (Bitcoin): anchored in block 957728 (2026-07-12T16:20:40Z), 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/PT4CA1930398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf733377906c1a52b93fb51fe4de38f189c3bd91818d00c15318a9273f3c6a375. 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/PT4CA1930402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a39b13fc79f92db2254f27595d552ee4d1a18cf4bdd74342e427ab68f6b8b3. 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/PT4CA1930405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905a77d99390a9c1e22310fbe43b3ed1bb50360ac83303cf9d663786986c7a96. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/PT4CA1930406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8945a8b99757d946ebab766389190c6824dfcd95e6fdae0b70cda877bf1c2d5a. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/PT4CA1930924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c03ca3f6c67fa323534eb89be0a509a4fed876266477b86ce2736d451b5245. 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/PT4CA1930926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc04bf52fe4cf10b00869518b3902619a43f763815df428e7cda6cc3e266caca. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/PT4CA1930929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6ebc04be4147c6d2b1249a938513902c313a742f37b4fc7132b9f0cb205762. 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/PT4CA1930931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fa0e0d50bf3ec2dac5bc1a032c40581de6d14474cfcd900d7a1aa7356ef035. 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/PT4CA1930933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9739d94269c137763096afcb1b6d4a87e622fdfdd6eec22b32d5efe4dce66c57. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/PT4CA1930911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3ac7fd60816403e0a7421ee646cc1107753c7afc5d462123ee2a0fd8070dedc. 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/PT4CA1930913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29add751c234570939859296008aae967bbed9ac428ce261f504cff3d91c7756. 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/PT4CA1930918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a166171b8ff9c4c8e62ff7f45d100b1baa77ce72d9fb20ef214de59bc4df09. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/PT4CA1931638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417222659d6abd688abcd72ba2771fcfb8d642b92d7a376e0ed8025ea94bfa08. 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/QZMZ92484231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54ef2baf936a3253ba7375f405f8917fb3d5eceb0798b9aa288feeb1a34dc45. 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/QZMZ92484242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fec8f90e38f13c4c696f439ad1f334558a8f92ca8db397ef6cf0e7b4433e1f. 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/QZMZ92493158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143151460f32514de4a7f4886b72f8072e8071c538bc36db1d5d7c11e642dcfd. Chain 2 (Bitcoin): anchored in block 957737 (2026-07-12T18:02:09Z), 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/ESA122447769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8a9637969962f986695236fd680f1b1a4ad845911b0334379302720c8f26f3. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNJY2484816.