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 0x864664525b7caa4878934357709de602cb85152cb31bf8c1e02064bc4e9f0ca4. 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/c8e0360b-bd9c-4176-89c4-1524820fe36e.json and https://artists.proofprofile.net/proofs/artist/c8e0360b-bd9c-4176-89c4-1524820fe36e.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 0x46d6b94cfd94c0da53fa03850f934d5e0c78f054aee05d47bae3cfc0813ea067. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T05:47:29Z), 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/QZWFR2304160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe381b314a3b26943576f54984083c988bc3a2bd481ff9784965fe1c8e2c0c7dc. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZFZ22485020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316fd17270be3edd5de78099ed28e2017a68d08e9ca5621ab7d6453b51539db0. 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/QZDA82489669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b46627b81ef38ef26ddc7f70c6518167c35a7a8864c1d58ce4c64cdee84fff. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZK6Q2455579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65aafbb9a504a513c49e5a12369e77c8fb57ff7e1076a510bf3b0890ce1119e1. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZK6H2422199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411d52f450545429e821db2d21522c3884b34dc19a6eb4e7f15cf3cd00a56611. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:55:19Z), 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/QZNWT2439382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3d64b70335c5b7e89dbc44aca9d04c6f340904426c1a5075e2296c4bf176cb. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/US3DF2482991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc5e462d66b22c23b91cb66224707adbf30c0b11bd8b8f17f88b211bb91b48c. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWX2404254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afeaf866751070b3fd01477d7224975577029f47c5784b0dbc5cf3530d334d5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTB32441851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be4d97030f32e79f6379d6d9b9481288e02f25dfdc4160bd73a5993d5fd29e1. 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/QZTB72485025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852b9b9e16247c4100a83c3efce4940f62f81440df3e3ca144f58c8e02340791. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTBC2488154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d83e0cea2f9404eb03d318b662cbcd7da6efea36878e036cef1be3803032b0. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/DGA0M2438190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8c07f4565f67d03f0402a2c9a1dc89f80ce9aef6ecaa0cd9cd50989002f095. 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/QZWFE2409848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30952519329f4fecf376d57706d4d5f0a20db2e1654f2b3596c1a80a68ec958. 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/USANG2461666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33a5c849016348e603210d1d3207c95e7bfc76c1e87749426adbfca13a919e5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:30:01Z), 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/UKZGC2409278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe915ac0dffa07f652578f275820e64199e0e93aa4fdacc7007558431653f4b56. 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/QZWFT2419847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d5b96199f61b71012c7c1106c23f2aa3a876746f9cc60c168d0fae755890c4. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/QZZ7K2490261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917f3f29d23c1727356c0adbd6cd6a3895376c5161ab49fd0230e719563fcb3b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZZ7R2494879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3845c0bbff541a6689c97e778c7b04c9c6da9dd0e4eb89e166f8a6cb716f736d. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QT3EX2438129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4cca0952de3de54e8ee2e405e6f101f245eb64464eb407b9c99ee0d4adc9150. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFYY2507720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5fc12065e3645e57147a28adfc20cdcdc4ca9bf70b996a0c048213eb5e7c87. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES82537164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x309786b139bf9b6d8fee3fcd10018bdb96b800d2d99b2a754b22792ea6122e87. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:39:56Z), 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/QZK6L2568564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307dedc34af7f1fc4faa90720cf0bd06a352016c7e1e2351a026340968c1fce2. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/US3DF2566613.