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 0xe5e479ae9a30855c5ed55d7122b200a0f5cdf6d00d926235771dbe4f2673d7b3. 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/ef7b18d3-2c0d-4183-8829-09ca1b5febc8.json and https://artists.proofprofile.net/proofs/artist/ef7b18d3-2c0d-4183-8829-09ca1b5febc8.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 0xaeea6f1dd870467e0701a444f3511d97dfbc1f90ee1e3866dfa2258bd0fa8d9f. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USCGJ2470332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ff4cd5741adf8fce526057ca7cc80d4795aaf11c5e33df9a36c0e02fa8a3e2. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USHM92404671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2b05199c528f74e3304733963aa6caa87c8feec844fdb0c9866b4501b2961c. 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/QZTL92532260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6bf19f95f49b74b0f481c262e17c439ac13a28664b885687262d61f607432d. 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/USHM92404675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9228c95e61b077d0313e4e4bcf6b16484a03c190ccaa11cabd59fd3cca0d62. 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/USX9P2490157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5aa4df3d87d16d6a7998251c8516219b019e50a30a4d9b4fe8f196b3db34f9c. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/USX9P2490159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0d6ed6a2c3ea2aed97ffe001a4a31cb44b0a95155c98ec7ff96f202a66b093. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/USX9P2490162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931e0c01ce070bcf0c612d0c7e5d117e276edfa3a4c389f019c2dfe37eb489a7. 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/USX9P2490164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c69170148dbaecb69e10762ef6ab4c566f7f3faca3289e22eed5a50c8b704c8. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/USX9P2490171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927424b42bc746c9d30bb389b2d101d0fd51de93493b9fe846dc6eff640d55a7. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/USX9P2422902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54270315ee4b67bd0944a0731fada2575aaabba3fbcd3532f1a8d2a9fde5525f. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZTLA2592368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe884c1e9928341745f058a6dad179da8bd384a616c51f3d7046079d1094dd82b. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/QZTLA2521914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2090597730b0fc32f79cc97031dde604338ca6cc0d5806e163993f661c618d6e. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZTLA2559717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44de78ab7c502d1b78fcd3530edb4cbdb2eddbb8e4d2e593cf6be10966e275a. 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/QZTLA2523444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6af96c7910f891c26f8602e1b484e8ad76b9d2631ef81996228d578c3df4fa3. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZTLA2535854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5164cee4665f037782b6700f6b4b2a9800dd5048ae9652964ea3e44a92cd4d. 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/QZTLA2542359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f0e1328ec02452925016809883a6125937376b6f7a3f97c38399b9ace28a6d. 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/QZTLA2540429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98d8652a25705a4a9e80f55944ad673f6d8d2b1cb3f2cecd8de46d385ee5ae0. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTLA2524124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadda2a6ae9248b6cf54d3e95f86b70c0b72772ced690ab35485850edde4e2c4d. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZQAY2528785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7ffbe8805c514542cb0b5ee01fa41b30790e4a177b625ac8a2224d03a057b2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTLA2504681.