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 0xb34b7d8dec446e4555e2f8a2d5be035e651c63dce4664328caca9c99b4af41f0. 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/3efdcebb-018c-4eab-8b47-85d929a673d4.json and https://artists.proofprofile.net/proofs/artist/3efdcebb-018c-4eab-8b47-85d929a673d4.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 0xa150ea6160aa52d1da1c7c0f88d633ad5b3f4deebe0784df9bd7c6f3465c2c76. 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/USUR10400284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723bc009341a263a2eaf9f3085b763deaeef48b9c2a7925ad9a3ea6a4470c893. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USX9P0618632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2338ad51cd7661195e45c9e8684536816d7536fc6081f6f344c51b2941d9083a. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USX9P0618633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682ee6d648ffad8feb0b6f18409ac88e4b876902ca4f9195b1835b1d15d6cdf5. 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/USX9P0618637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e082e336adb3540ec9a626191dfac910fc2af1ce2749f20c757e03a7e03896. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/USHM90560500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b637596f0e15f28e8b592d16b6c5d81379cdcc3d693568246a908b434894f4. 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/USHM90560501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447a045d8dad4cd62196f729bec34a320cb4d28ec6e58ece68b8052e4afb414c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USHM90560508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2723c19fe69fbefa7b4e3b0af30388a70c54bfe6f54affee8b9677442aaac1c7. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USHM90560509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc6eca84e8f56f2c9ee94dc1ba586c8492a141d8e1a400bb7a798dc470115079. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USHM80641412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1579b8360ea1ebf3915e882e525df8c73400059403363347946beb53e564de0c. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USHM80641413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ffae0548cc5b10b16920389339ad27fbc7974dd67c10ebd84c7bedb1b9db77. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USL4R0709189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9539f1090180d8d5a76695a4b67050f04a7dc375eb8698cf6c6862faf6dfcd8. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/USL4R0709190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2010a7b762322b6bc34a91633bb6b42288dec59717b313941a4348dc889519da. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USL4R0709191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb39d41955be5a6e95c8cc6cef792da87b8879ef12fcddfe1070870c26c609e7. 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/USL4R0709192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ecec9e337a7af75bb2944c7daef81aab48be874bf82b2306824c81b7592072. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USL4R0709194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414c0680d6a65f92ca3add6226ac8c7d757cf08331a3a0e38237a0eb4ec8adf6. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USL4R0709196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c160f4071ab04101cf56f4a4e16801c1422ee531e7c5d241ba9eb7b76e07a54. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USL4R0709197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9a678c0e3b60f5eded02c0b0108b01fe00f2b5cefcaff6b5420139907abfd8. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USHM91278288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6232111b26a5351b42d5eee39b25e5c020b4865019fea0cafd2559f6e9184203. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/USHM91278291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9cd6b782e5ce57b69494c71c724e8c9173f604a3cb133153e768c6d7f4d547. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCABR1307763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51c4e3f769df07a239ded2ea0434888748263cd2869493094cd3cf5b8944ed4. 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/TCABR1307769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779451922965210848cae0c69e9515be085ce70b5b7c39ea36064de5d09ab43f. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/USDY41661662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f7f32b79d31c4076c1f2daa4f5fb7626e2ad7f174ec349359da5218024beb5. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/USDY41661668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30199d79fe5f7bcf693ee973c92f6d124dc54a65c507cd9a5519324d68f37d93. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/USDY41661670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe118b07fcd32b60c192d71859a449e1822f101d8dec00f35d3fa42b134137be0. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/USME31600243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e51ad3708f3726d86deb1961e1b52ca875f32b04555f9bb5f03738db112102. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USME31600245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392d77ffccf5eda80a1d1705d628cf74ea375a5ba47b01164168afb7c60dbc47. 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/USME31600251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42215e350ea2f3716a69a414f36fd07183cb5824352ee2936b283a08bd0ddc36. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USME31600467.