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 0xd74d660c15d05258ea40eb236e9f033f60695ce91a014dc7e456dfe4db277275. 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/f2f2ec6c-0389-456d-ab84-51eabaff2406.json and https://artists.proofprofile.net/proofs/artist/f2f2ec6c-0389-456d-ab84-51eabaff2406.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 0x665c56eed58caaba1f87d87ed617b7e5f05ac8c767c9615ba3a7dff24cc4f9f9. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/CAENV2460548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517bebf98da5a419766824122f2accb83ae14f826c1329248673a6d812e64df6. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CAENV2489601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca08c2570902960cb6775307bb0ad0644bc172b18da54313b93c451177f7e44. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CAGOO2458681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f76ba3126fa33c88e8be2bccc9958667a7bc2b81e6dbbaefcef781158ef23e. 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/CALVP2418223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e9be0b74af8219e9038a58e7ac2918d9692f7ee727d848fd3a5ea07d2c1e78. 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/CALVP2426111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae793aa44a65657de56e00406153562196b39049e3f4c04d9b5e5bdc21522b5. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/CAGOO2485970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc22a255c24f73014236e8842599763b5fbf4961233d7446b0bc1ebc9e8c7d8. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/CAGOO2485968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0de8b941e8e013e4fa3f165af72b23fc0ca4da8407bd4b50ea57987dcc7ff7. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CBF8B2400587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7095f479a028a46743827b84d40b14559f4575d6c2fc50c5b213b8e67d8892. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CBEYJ2486038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda50e0eb56d1254de60502aabfd5a5fa2dd8bcd0a9577bbde602b17c423a675. 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/CBF8B2424383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e65c015d312669afee86c4b26bdd4018a6d3e700d7cabb4462ca825d075199. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/CBF8B2429842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289a924354df50e7c89e95d0a9f0b0350ee0bf646b08039b5d0aa5d4712da0d4. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/CBF8B2437625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74cf5b2344bd0ef8876055a08d0133165cccdce8bf91f99e0f85dbc8ca5e1147. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/CBF8B2472482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592e170c252ec890de728e0774108e224c266b5f424faebab4c666bfd664397c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CAHQJ2534272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093600538a2e1744441e79be639b9890c69efae40426f498448858a39dbf11b4. 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/CAHQJ2514158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c51b19d3338a937566cf743bdb142698449e4e341d4ec798874e3cc84b386c6. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CAHQJ2537642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b74f4c1b5499fe8c8144efa2c2f22e80374884a8d63b84f7fa8f47c8786a07. 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/CAHQJ2553390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08101fd43a73332225127c04ca93d9ae3d06d042b707290615f3875ce234991b. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/CAHQJ2583633.