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 0xcb994b95499e3ca68caa0c865fa4ad9168a5537c8c26e1699afcceadab0d8589. 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/b2dc10b4-a414-41f3-b0fc-947aa52a0cd5.json and https://artists.proofprofile.net/proofs/artist/b2dc10b4-a414-41f3-b0fc-947aa52a0cd5.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 0x7edc5062a485a6307ed54aa8362abe1223c3294d2641755874bfa3b2be5b0c0b. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/SE5Q51809510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87361d7a089e48188ea873f833fb54b39c1455f9cf92cc21eb6ad87bc2b79e1c. 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/SE5Q51809618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46dc6fe731c09dc33f2dfe0c050b6627db79bc1132855823615be7710d793d52. 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/SE5Q51823307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce3173648cd976f362dc99345b4e844da98f75936c461801e63d4201b4c8419. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/SE5Q51824314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ed62035c6a0e91cc38f7ec7eef171fc2b81dcbe7076f10aa38babbe6fa052a. 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/SE5Q51813653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7a96d84b7030e1f6f26251060b62eeb8497f903494ef854ce8ed2bcd306978. Chain 2 (Bitcoin): anchored in block 957705 (2026-07-12T12:50:42Z), 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/SE5Q51807936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1bd4759501b8506bb87b732c3dc332a24c2ae9ed2257821d616d882ef958118. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/SE5Q51823556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc6c6e4f4655d57f7943a85548ee0f4784ff3e77af60ad112e6510ece85e5e0. 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/SE5Q51801604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728000208a16defb18f5384c44679c4e3a9dad93ecac04fd711db2bbd4d0b920. 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/SE5Q51823337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3143f74735ee2c055bba918158f079b052d0ece0fb1a08978e219c1068617f0f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/SE5Q51817694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ba742d129af7c45d8ad4b2e00394bc70241e69fd7a6600079e718a769a1f3b. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/SE5Q51803880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a795abf6452eb1bfc16d5a7802eff9fc078b02a9885848e7bd7d0bcd35ef99d. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/SE5Q51801300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22389b57083dac78f64fe197ac221089b858176fef2f138b216abfb33f154e1a. Chain 2 (Bitcoin): anchored in block 957695 (2026-07-12T11:16:12Z), 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/SE5Q51802444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a5f9bc116b8b405f1d10388757c6f6eb1790b47d4ba727312696174c3f57e0. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/SE5Q51801837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86f87fc51ccfee2346680da57b63c4d608b1e4d9324eef79e5058326fbcd73c. 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/SE5Q51822312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c27643f273a131543c971b525fbd06414a6fe9f275700203ede396f2b5ca32. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SE5Q51810880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe07363c9822298bd8b6e504f8241fcbfad3bf2e67763a70148194ee9c02a39d. 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/SE5Q51814382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac69e8d791c0dff984dd7cd2cf435051b1ef6c036053ca23b0640c261908617. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/SE5Q51807058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0305c6956c296eaf083d6482833255f2945a556933c6eccfc8aaeb47f3e3cfef. 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/SE5Q51827169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa945384eb06c83f04d71832df15e4b841092f9b487d4e42502ace4a9374eacd. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/SE5Q51816520.