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 0x84579a8829c33e2248f28ffd4ee9828c67b6b324eb7043df12efac1b885758f3. 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/8c7d82d7-4043-479f-9ab5-8e56e863f39b.json and https://artists.proofprofile.net/proofs/artist/8c7d82d7-4043-479f-9ab5-8e56e863f39b.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 0x09f01f706bb568ab29e040a7dfae5bd3a8df0239bfc0322f4cf222093983d0da. 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/DEZ651118910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb5e7a30b07f97374bebbf2a7707161ab31eb0c639ddd034d8b9d4a2a7ba752. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/DEZ651118912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f7046797f9ae60954ba71d69ca0d46a8d86d7e339b6e2b93beaa39dbba2bf3. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEZ651118913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437681ce90b992d80653c0f705ce751efbe38f0dacaa67c79075d474baaeb055. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DEZ651118914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a84fcc3f018b5df7c597b2840eabbf43eb519614dbc3ec30b665fa3592b056. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/DELJ81749123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3722a31d0b62a2c45354cd6f48e266e6105d05b880baf1a8c8397ad8c403ee. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DELJ81749124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0d1869b054894972daf3a83c87c2766a5494249ce36d3091a671509eaed2449. 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/DELJ81749126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84cb17638e7f4934db21766d71b269ed6d90f45682e87369e4e73acc79de3d69. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/DELJ81749127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbbee1e81c31bcd6767c2b3fc57dc6fa8506e381bc524d8d9a82b3f7ec74abb4. 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/DELJ81749128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8510ce4400f23a33b1f4db696e7c972c5a0822a340c837caf163265789ed18b4. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/DELJ81749130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b578f3f1586640d6ef6f78075b6db2784d933da5e090f57ded144e9ad056d97. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/DELJ81756690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab5f290d12fa5fe4abb36e337581d30ab9e8b20191ca7338d1988d511463498. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DELJ81945785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595eb660a971d0288d1c0da59cc2068eb3272ec13968a1231d933e2805722e6c. 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/DELJ82095733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a4d404a96f6267be073f69f10c7f17851e60d2280d650a40625f9485e4e029. 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/DELJ82095734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d01091e793cffd81b44a2400d3244c82f82531717961d927b4dbeafe12730f. 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/DELJ82095735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ba4eb4f09860fe3874eb196ebbbd2197bd2011c26aeaeb5c966d69d90fd0e6. 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/DELJ82095736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a457fca49fca0a82d3653ed4e3bb66a86d84fabe72a2c87bbd41036d5f98834. 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/DELJ82095737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdaa0d34b343f26b4aefa09e28b0be97ae3750e2c27cf2162c4c7b22b22a1fcc. 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/DELJ82095738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325cbe95bed152b2e183da59e605cbc5a2ab5a8254867f43e216446adff392b7. 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/DELJ82095739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a93746ac50ac3b5c025df00a2d980dac249f33b287856219365dfed7e09817d. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/DELJ82095740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1780d7eb4ca8891185bc2cd8f7f843a276d53f741654f2a8bb877026e5fbe7b. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DELJ82095741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fc738e2ed5fe1fe8631c0b3a3b6ebafb6332850153f3158a00cf19ef66f037. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DELJ82095742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2252ed4c02a26f6f0c6e5fe82fbfe6b6829cd7c3c0c4711d1b8e4e7496dee8. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/DEZC62590463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19845adf993a75f3712489691ace015ee0449ff68dc241490a53c08e315ced30. 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/DEZC62590464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3daa34f808b623ba6e7285ce6d01211f4f1ed6d80fc31791cd44430185b52e26. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/DEZC62590465.