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 0x4e9c21d638b37e796b7e0441a5fde14429160cc28f2b0bee79a2b4e921be455d. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3e45abf-d796-4f83-95d4-f29dd18c3ccb.json and https://artists.proofprofile.net/proofs/artist/d3e45abf-d796-4f83-95d4-f29dd18c3ccb.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 0x5dd144d97226282fe1cf9cb3ed3d5c0e3e0dff95c8230c2a1a9f6f1c6800b522. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/GXD7V2280779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c681c3238d2bfb2a75e5c6ea4fa10e14a6db1eef3f2f368c0ccaddd5650319a. 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/GXD7V2278267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59f58b44254d989831a94028a84e9aaf932272a7d4f1eef98fc09237b7ab3ea. 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/GXD7V2217917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4671ebc2916998f899f4dec836c40f6e46c90d2a8b4431be59d0b93b90cedf. 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/GXD7V2434764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb2831c2e5a7dee0a55a69f1b6b0ca332a88017a69f7e8eecd8b2dfbfa28d0c. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/GXD7V2418927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fd36caeef2ef945ebc19b5aef3fb0efd2ff8fe2125af6c15842a1afc249a9a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/GXD7V2426889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3641137d8cb1f2bcb6a7de8bdef57170ff0b03dbccb02ef0566665bbc80c01fc. 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/AEA3A2259937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d3ba77707daeab9d86ab68bdf2849f045a5c8fdaf55248b1724748efe7a0b9. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/AEA3A2273918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d47bf71d0e7f6295c850b622a7fa5d836ff0ffed422f74f1444cbf6e4f66f0. 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/AEA3A2269693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73147513d96a3ebba10a22da6c3ecc5f4dbe78974ab4b61e5ae18a80c66cf9be. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/AEA3A2237082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8890401ca0bb8b6fa6a956965bfadcf04a2c9f20241640831344f5cc133efabe. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/AEA3A2219267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6116e9997c99433d03a040e732f9f47221047a66263c048f326883b389e097b4. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/AEA3A2232436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa100f25f6c8c3ae8cc4c9a501582bbc89ecdaad1a07581827233e2bc2627a856. 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/AEA3A2281600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e58cd4954c1e6ee124faceb460754fa5eddcb818846f88a1743c33360c4e7dd. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/AEA3A2219955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc396658764d47194031254990a553a26a6041c5269911d9829fc1af5412b1f75. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/AEA3A2239487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63d0a3fc2ae4a9fff0084aa26ecc3267524e75dbe5ba0bd94fdf6655dd46151. 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/AEA3A2229519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1f8d2824ea64501757bbfa5143833b337af575e43fd78d1a083464bf018b13. 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/AEA3A2250213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f5623848f1b268aa22d014e6d3208f83f708a138bf6fa47f95773dfa6aaa6e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/AEA3A2274756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c444ab9ae5b6b06b43f8ae06b105c1d54590502e74d50e3434423afeaaf633. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/AEA3A2298764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6dfd635020eaa961fc9f788677a88429ab2c8054eba5d535a3903bce504da98. 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/AEA3A2277800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72cea242a871103519738e9fab59ee23b4628e74534357f826800d57ecc35968. 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/AEA3A2204396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3af22f75227a66b758dc986d4a3e2ec593c5492bbbbfb730e04a963c6e5b35. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/SGB502532475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a8ce7e3e57c549e615567253ef5e101580cc0e920713d3564f57523cddbf3f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/AEA3A2511088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99051c98c1aaa40bde9a6e6caac14fdd629d643e0a3f7e04485bfad403cd0c8. 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/QZRP42545252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6540f2d4227776d41de64547b1d99ebb97c4b93b548d6eef61d0ae3392d7557a. 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/QZRP52565053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff4bc759bbb4415a0bad444c8c567a3fd835a8c05d3d983b49e32aa3ebcafcd. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZZ7Q2563002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1954c3854e2ec292649e5da43931a4e9665c7f43fff1b48a536ad7dd5191403. 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/QT3EZ2548095.