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 0x346b53d0c38b4cff5c635618ddee986136b78fb37df0b975ebdc7d05d52053af. 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/db1152b8-1f8b-4350-bd6f-7d810d60c252.json and https://artists.proofprofile.net/proofs/artist/db1152b8-1f8b-4350-bd6f-7d810d60c252.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Blake Sings Public Domain Christmas Songs
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 0xe11f7d8a8fe67a75844091f077a971f7db3ab257a17cd4a4634b95bc126509c0. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZNWW2160844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d211d8440d409b184c632adb2c0be37f2e28846556220c44a63cb9aee883f7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWW2160845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fcc64fc122fc9a8766ae95db5aeea97a7f7f4b6da5354ad7d6e71843cddebe. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZNWW2160846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64924e8b473d85b418a52dfb7de023b0bdefa7ffec27b67b264c7c0dcc1e069e. 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/QZNWW2160847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20c103413142ab9cd21bfa6fac9b2084857c358c1c439fea87e4b450671fb0e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNWW2160848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e514e017e1bdf9474a8fb4fa78eaf5dfde078984a03a61af93eff2172a971d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWW2160849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e13c804f8d601712c8b0ca8eb0dff37f07c218bb44de3a1e078a0dce66ba9c9. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTB42234341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c546980643fa1b9fea0605d820cbb452b6e6c2c96987876030476194b00a9d. 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/QZK6Q2351118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf840ae274a272cb4557f30dfdee0a8de129085e5dde937f7cd53c123c1fb31. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZFYZ2306101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272f37ab68dd6b23c4730c6d9ec71f0aa20159637b1398c3af5e5eb9c11dbf02. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZK6Q2351119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c8edab8217c35c95d2f8a91f4b14c2b534669df5b7375c64178e8c35bb2262. 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/QZK6Q2351120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd28be0af05d616a30d0151e7f88f80ad635b228602770cf3c49a8f5b17e930. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZHN52306481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9722bfcca058497be5c8277ab1c00fa0489ae73135b07fdd459a5f8ecca4ec6. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZK6Q2351121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac4c12c529d786f6520de4b0cc84e46cb539f294d1076baf08b5c68984d6288. 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/QZK6Q2351122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c00c1d995601e815df07d6698f57343ac0ac2edb20648060919bd5922f7206. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZNWZ2352055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab002b0599b49174f8f6b94277c07689a87160045b0e3f181fb0a856638970d. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZTAZ2358474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85fb27e5f837c17b7751cf2aae5bce2b074f6d51c273508e3ea957e01426f3d. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZTBC2386232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4ec0d5091f66943d9b6a202b7b8974a334c56a2ed64470b240f5fe45aa22ca. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWV2345378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc614d77a43b2ca00de499ccb1e7c64886b6b21e873fedcd824d5c0860034098f. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZTBC2386233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c00c1d995601e815df07d6698f57343ac0ac2edb20648060919bd5922f7206. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWZ2352055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1aa04c10a99ca1d443526c446fadb83638d4f9d7d495d0b4f557df1e1667e7d. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZTBC2386234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511b0aa1d497be30b255fc21fc683d3060c69e48e51215beae779640be36ee90. 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/QZZ7U2476709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca86020d27fd3761d01ac8c4d5de516ef012f72d82f06d8436387a0fc39bd2d4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZES62555259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511b0aa1d497be30b255fc21fc683d3060c69e48e51215beae779640be36ee90. 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/QZZ7U2476709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79e5f93523e9e54b6ee20b7e9d792762c838b2a9e5923bc0b81e178e1932ba1. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZRP52501326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511b0aa1d497be30b255fc21fc683d3060c69e48e51215beae779640be36ee90. 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/QZZ7U2476709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556666a2db83421131977b9304131a775bedd71a605651b885e050f2d2c79d02. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZRP52501327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219e941dbb9073340ec3fee0d294e8cd9296b4c989ef062cb98af45fab061877. 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/QZRP52501328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca86020d27fd3761d01ac8c4d5de516ef012f72d82f06d8436387a0fc39bd2d4. 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/QZES62555259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e25b19c2f004beb735590ff9541eb8d0e688bfe2781eb928d28ab8f0af90d8. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZRP52501329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2abb85ec162b17f9375e5987fabb3d13b1ed9ceb7819e46f164b68e9606b770. 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/QZRP52501330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ce232bdcb588ff91e362e8be18ef90f39bb55a93042f57bceff4f05c4efebe. 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/QZK6H2526541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e6eb75b0b5397c34c628304db921f3c62365778bdf42fdb05f4f9c9f6ab25f4. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZRP52501331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed07d2c6debce22c359e686dee6627632636352a26151adc0e23ba290d926fc9. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZRP52501332.