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 0xb10df1d97cd5f71b1742de6432020d19b07cb9d1455abd81384e5819f0c94c40. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d818858a-264c-4390-af78-2fd60f74323c.json and https://artists.proofprofile.net/proofs/artist/d818858a-264c-4390-af78-2fd60f74323c.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 0x72126154f50bc638bc9aaafc3197eef0cd979c5b714e819dffb22eb7420613ae. 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/USA2P2214391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a50e0a661cf66728fd9aa93240ad5a3f5db914a5fa76000de093402370f050. 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/USA2P2224679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a15ee42a4c98881826b56f575c9e0e21dc35725661d2ab85a23dcacef7ddb3. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USA2P2224678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9220d7c60c4a9fc02a01ffa4a9576afa04c224879f24c8b45b1aa7e6303aadfc. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USA2P2224680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0e8af11dbf9d264a480374f5f1ffd0ffc29cad211af92b30790e5a505f575c. 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/USA2P2224681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc146d80a64d3a43c41575d54eaf50e47e50c0835747761e9e6244c9de8761ced. 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/USA2P2225115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa330b904a02b3897b1d30639b28139a8c583dc0d3d0c9f200f722813bd42c344. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USA2P2202598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf870d6fbfaa14047f009c66c5a4984ed501d635ade07ca9582a08c246bf7685d. 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/QZTAX2330371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa15e92aa398bf70796699ad2c35f8d28b0f1792278808353aaf9b829493aa4. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZTAX2330374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30f9545ae8d566526edf39bcdeca67303fcbd5e5a7cd1f649fa937335f8ca96. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN42228892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19acd613103b1b503824e537f410cd7b2220899b3982b65429cf759cabf23436. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZNWW2113235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e419a12f520fd50cdfef8aa8c6514e6d83e81bd4192c6572a5f2f9f32ed44e0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZK6J2166462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3634cf393e90b908e6126cc3df9a82ef1cd73785fe39d0543d6f22df233fa9. 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/USA2P2228056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad8eb13aab62d82f45e5f188d93731b394454b72cda2f0dd7d5aee563a2616e. 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/USA2P2228060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19160a218e812d6529fda98994543875d21e781cd8441095756a6b4206ae1b80. 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/USA2P2228054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfc93da1078ae30a8502c027a984bb8451dd10e4223e3b98778885d4229ea03. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/USA2P2228067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638907a14c1bc997b9509fbebf61cd4f3fc0c6bd426b27998b79d7694df92beb. 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/USA2P2228065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399cb673544e8a3dd4d5fed445ef861e2706b35e7ef488a7a5d7f04bffce123b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USA2P2228055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280a25f6e14fb81f8c5eb4f5fd7be34cca2f91c7cc2c9563c00e35d12ffd5efb. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/USA2P2228058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cfb494222bcd0af052584f31c15b22f94d9733cf98dc206fab3c43223e2036. 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/USA2P2228064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0755497a1e6de2ec5b49547822ed90cf040728bfaf4e05384e59145566eba6a7. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USA2P2228063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721a181cc312942f77eef81adb53b655d9f96df16285ffff32ef0dc56e217efb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USA2P2228066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3940ad717f358d516a064bf357fc37e76c2eb377c66271526945f706979e1c. 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/USA2P2228062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411c2cce8deefbfedbdbac74a50ed8b4591479c8a5b559825cd478d998934417. 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/USA2P2228059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1670453ba1a056fe95f4c9544c54d864553e8f306c042b45b75fed3b5e3792c3. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USA2P2228057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76cc10ff9393adb28a1d148a505051d2b1db73080f7ac4e29da264277b779b67. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZRP42427156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78237c4fd868bd416d14c9a8f073bce1b586de4e32a95067b9f2d65d5bab2220. 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/QZYFZ2468028.