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 0x44598130ff9f8a0277387ba09a6c64a288434fcd69389731d3ef2aea070b3cf3. 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/9567f622-b61e-469a-9487-5d460834dbd0.json and https://artists.proofprofile.net/proofs/artist/9567f622-b61e-469a-9487-5d460834dbd0.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 0xaf7d519518769d7574722be7c7ca92766e1d282a60f040ca6708bb1c51bb8287. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM42K2098117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f634dd68f1fa1bbab1c32bdc34eace3ed0e0384ec5208964c476630d9fbebe. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/NLRD52023119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf280676d6ad18b5067e8b8821868c81e0d75094603c7a5fbbe94e83ee769d475. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/CA5KR2362755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa49fe70befdeb6c15fc6a4b242cb83df0f1a74b015012690a49a35693c7bf84. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTRX2395336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8c10609dfc1aee0ba88cb62b42719aa2fd87698f393c6f52d9ec594683151b. 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/CAR072400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9988fadddea41067a6b8b0aafa729cedf541150e64904d6546deea5c14939cd. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/CA5KR2516247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fafb3669df135071615c230eebe242993b046d395f955bae9c530262fc3e984. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/CA5KR2508062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f962396807630d1cec47fa40c4cef06b252d2f443aadf26f3898e8f6316c71. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GXE2S2500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6752daaee944f3f47723b11e1e546805d074ff3b16bcdea694ddcf96bff91c75. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKPL2287994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f3a0fda7c4e9e4c52bb65dd2445e85bc60c236c779efbd6314f4f13d07889f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2125292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc53c27305d772036a1b618acbd30b139e235d2246a014920cb4dd9f6ca8859. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLRD52023152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfd021c46e6e2efbc4a5a8a54eea5813fba82f357412264c8e304c80ca23217. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZTRX2474420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286c29c717542d7912991dadaa1b0ffccd8b4d8c8fd1ae4a371bd4180353a3f1. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/USA2P2403011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6aaed89f6c0a625499e28ccc82f2b65446b58f16c8e68b19ac1f971644b2906. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FR9W12443431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee566bd7873a5463505e725d2a30ccd543bc01d11fc5d91c3ce9f16c16be399c. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/CA5KR2331916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6aaed89f6c0a625499e28ccc82f2b65446b58f16c8e68b19ac1f971644b2906. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FR9W12443431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9cf2c56db7498eb042fc09b9840ddf580c5a06b0392b09478df3dcdd58efe2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZWH32500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5bd7efcb1b572005b60551fbd04f085faf1860d0aa0d2d5c5ed16a6a461cf7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTGW2400626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9cf2c56db7498eb042fc09b9840ddf580c5a06b0392b09478df3dcdd58efe2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZWH32500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50cab44035826422e24e2b612f8e20a31e5208daaa4f147c2381627a2b254fdd. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHCR2100156.