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 0x85d0be4ad4a3108cc526f7a6734708b65f7e217e65800cc4b8c2d017bfd7c8e4. 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/360104e9-9681-41d2-9fd3-76b32d2cd8ad.json and https://artists.proofprofile.net/proofs/artist/360104e9-9681-41d2-9fd3-76b32d2cd8ad.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 0x38f8c5b54f779fa112f6e9d537ae0f132192b03d50641ce128a87ba052c7e1a3. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/TCADP1835032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541a7985d98dc0f0537d741a240af2a2695bc9555bc3716d9043b78fc0cbd857. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/TCADQ1892177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56093ea8caf99d7dee85d94094de565574ca230c8ce8d9f5a5f92e366ce0ee47. 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/TCADQ1892182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a83c7788363c37b7f7fc7fa9ccd91aba860e63e3de3db874ad485d46eb0e822. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/TCADQ1892184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e13e5aefcb6ed1188adbb2dfba12247db7ecdc79f18825259669670f811c1d. 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/TCADQ1892190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3579937b276a10297bb1d4c00ab9bcbc279bff78de4aaae9f958cb73abdfd6. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/TCADP1815872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5e80456d8fa14f459c0b5f8824ff4fde679fbb103bbf63b79d0c6e26988ae9. 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/TCADP1816083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180442bcda52f1087087ce75a22bd39d63032ec416b6404330c20264438a3021. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCADP1816088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6b25dfa7db501408c8e19da56b59aa698e9d77b74b236114923f2592875962. 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/TCADP1816089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d94e41603c26fda19952715fc650a420ac7013cbdc9c2126e946ccb86793e6. 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/TCADP1816091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce78acf1e65e7c6ea1064544366f548e748af2a61d586a77fdc6fa9bc665ff0. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCADP1816351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d688b0d6b1b673d876adf2cd5555be0a35983f47bc661eab80ed41648b2a73. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/TCADP1816098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39728095c57be41cfbee5fb14e6f15c14e7b160fbb2310a8049e76ecbfe394af. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/TCADP1816100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31d0d3254cc38527a41c6e2c6a32af663350252301da55050060f75f1c4c7b1. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/TCADP1816104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9543dcb0d2fcdcd7051aa410d46c8b1e72a6cf6dd80ad8bca98b133a98ebb22f. 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/TCACP1627860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd30e17c721c16a323e0de3463a488dfe4e4ad3b7ead3f574988c69e01c44a78. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TCACP1627863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e2722f370e5788c2513a4429ee82f877a9d58eab4dbe535f0764a2d5332eb7. 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/TCACP1627864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d9d60156488f71be55c8951926f1fcf269cc457a23e9cdac75bba731ea2cacb. 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/TCACP1627867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667cd504f98db65b3540c5e7e2886f332b413498e1b96672e418077032443883. 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/TCACP1627871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e8031a22feed95b6672662a07a10d89d43441c29ef861dfa90f74478d8e9254. 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/TCAEI1972117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b9f670e859aa29d8bbe203185ef29ef5b360e6952785d4906bb26d0e3b461d. 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/TCAEX2037472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa326d5dad5a3978c44b438f567c8d95695b42ad0b441bc043813bb73b6f20f14. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAFA2037637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87b9516fb0bf6ec2eec2752ea0172a7fa0d09269e3bc6e202e6234cc80ebe0f. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/TCAFK2107609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920cce803132a9174f6ee358d540c524bd675ac9003d7ef13ca767cabf42641a. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/TCAJC2409921.