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 0xeb82d509b64345044e5f5f226545c077bb8caba4c0e2a7919db3c67b52485988. 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/79f54244-3791-4469-be0e-1f4ece0f0a61.json and https://artists.proofprofile.net/proofs/artist/79f54244-3791-4469-be0e-1f4ece0f0a61.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 0x631e8a07225a0a40426746fdb845d3701e86d4fc8191635917c2afe8e5c759ee. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/SEXGF2398884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43c87b98875099f0c73b5e8cea452d38e6e7f40dd74cbd88c64d94e2c232338. 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/SEXGF2397636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6377b62a974a5fa7660a08af657a4d5f36bd79789a3ecaf8c704b809f2e4bd. 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/SEXGF2397563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2df2b29f57b51fc13e5dc922939adb26be68a348fd11a49f247bb543bacb7e. 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/SEXGF2398862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e30c6c6246c778c3f689d9f3c951991e9d47845ef07d99cfd2047ca5d442790. 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/SEXGF2397499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c4b55268726101922dc98d377f7913a5583cb4a72490e281704893ba76ba09. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/SEXGF2397460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3304eff7d7d459476ac5b227a05ff4888741692b8a32d9097f906796eda909. 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/SEXGF2397354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50898b83ef8d02a5ab2b39264b07a616257f882482dc1a93821d0704bf4e9ebe. 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/SEXGF2397307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9906b5beec4e3f3048b8fd6b0f97b1eb7b4b3214a6cb778708e8200c0081b8f. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/SEXGF2300457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47aef5ff20b6d18acd863a79ccf712ff408a0c6da0e8944d38dab118f58c3a3b. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/SEXGF2300458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8dbeff5d28442a0cb1247bd9935eaacf6e7d734a76d68824b0a43c27d8617dd. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/SEXGF2203200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744f79d4183b572f407ddbe7fabd037ef7a94e6780d1e35052d91fa612255250. 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/SEXGF2201017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbdb966e2219d143a33625f6def7321320574d4712e0298c51c4607f216344d. 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/SEXGF2200194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4dfb3ef7347dfecf33d4c214f633b4db41796d86089f251a43acd5791e9915. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/SEXGF2200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc45858dbe7b0e008c2ddadf3cccc3e1d2084ba3c6ab0ca845c8ad5ce914191. 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/SEXGF2199407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa198ef7d024d34e4ef303e86b996ba606aa317ee63556619015fec1c9b3e1558. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/SEXGF2146801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb21ba4268dba91318e7f58a20801b90087c6c2b061583f5b997d863f5e2ccc. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEXGF2125701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c90d11c0582b8d24c490cf8dd696cc8eeb762434e5a49f50a999b243528f0f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SEXGF2029401.