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 0xeafffd539f763f3b1e24b80e85f2981cedd912096f139f5949989ce46d927377. 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/a8951e58-bf8e-4237-9f5c-2cd2b0294615.json and https://artists.proofprofile.net/proofs/artist/a8951e58-bf8e-4237-9f5c-2cd2b0294615.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 0xd8ff72280ef694dfc1d8a7ed04018e1f227f8714bc191a0db503c6b5493a22ca. 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/TCAHL2391883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3777ccf09a26364d48ea9bf6a9248543406be3cc70d4fa7f9a965d234bcf81. 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/TCAHM2311208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1715de54353a616f10ae0cc1993706634b40588ceb41457f8913bb606e740c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TCAHN2346564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9951302c99e9b6c9a298aac12e88ee8735679d81d31ad42d406eaa70c11012. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TCAHN2368807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc070f49d6d15125a0a1db8a5a8c3ecd2a342344d2b4760fb70ef0a345525842c. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/TCAHO2328706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5fc19708e239577b318f451f67f28f17791f1ee9e358ab56bd548b1cfd5c93. 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/TCAHO2391011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829467a35ed044b19867fff8887ba6fc8df4c7c3d6a669da1915aba611921dd5. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/TCAHP2304107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb208815f7e394d00435cfaf9882c1d5462e8b4d8a61cb98094220b1afb555a. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/TCAHP2385502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f77ccacf5e90afc150c6e4ae49215ee410eb7459835098195ac7bdc896858b2. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/TCAHP2385507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648e96e66c43b8b50ea34465764ee9a4a695994052aeae2172c487cc9960fb50. 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/TCAHP2385513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd471b57febd66636249a0c136e9187a795a573b59d8e86e0f7d70811c40626. 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/TCAHS2330752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f112a83cd239acf3a5f5bfb9ac997caedc450d0afcf30da42048be1fb07ea9. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAHT2475262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec8d768a93ee55d6c8ead609d0ceb6d86690469ab98dc806ed41f57867fd534. 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/TCAHU2432996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65088487e9efa86d80563ea540c3987ad8585a90a05662d45e7fe0d2144f8657. 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/TCAHU2494199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2e2e58c574a0f76355ca71e2d82d20cd2458b9b35415d1b33cee252489079a. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/TCAHW2460169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6d0759e1ce0e52e27f588719964f56835c0bb4970355c5dedf7216326f5981. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/TCAHX2436733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406c16e9c79a13906632e752a60a185ff2e1fc7d7d6f7904055afb85e61dea82. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAHX2436748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2553a027be84ab6322d9a5cd83c33019726e63589f22822948511cd36f40f59a. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/TCAHX2436751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59470fb70c5ede133e39b7fc5ef8dcc80c62f778d1ada93d2b0d066fd5a23dab. 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/TCAHX2436756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d5ea393a91b4979d7d5958c27c342477e5f798cb2e3fd4f3e4e462799d4cdd9. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/TCAHX2436760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc624f29635e1c670cef4e6542752f0811ffe3988a981df9515e4314e4b84ad6e. 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/TCAHX2454244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0397a1e53db0fb5d62a3d51ec106e0bc99f82d330d9e7d9cced9a02777713b85. 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/TCAHY2478088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15152b88fa907d09b211a4b408467af95c5a8c670595fefbd7b331e766b7c832. 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/TCAIC2478042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4da29e4803dab99354e39616b6ac515dab26ff554778a0593a9105edd5fa5e. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/TCAIH2461453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae79e7c35e25e39bc3e56398e931825f1a948f845575a3ea1e880414b5620c1b. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAIS2472457.