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 0x28b9e524322c987750d07397315146d07b081be1afc4b87185419455560ae19a. 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/e201d830-2f64-4c25-b2db-1227986b9364.json and https://artists.proofprofile.net/proofs/artist/e201d830-2f64-4c25-b2db-1227986b9364.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 0x739f63c11a6d5177dcedf1a7c12c9cbf5c8a7243d01d6766232c50f5d04d0472. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6Q2111901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c03741e254b23df6294c65d6894df62bcbdf8442e45a47b07187bc304444d6a. 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/QZK6N2261009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8869a8fbf01bb45892b6df0cd9d3c45b40f524b8c39bdc55d6f9932dd365ec. 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/QZK6N2261010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f1fd6385430c4bdadf9abc14a95dff6c83420fc0c3a1b9b065bd70404bab7e. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZK6N2261011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862ffd8485d4f4303629324de89003450f2e8c74f2fb1b1dc1320d5ea632735b. 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/QZK6N2261012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b8639b28098d70e5431c9cfc5839679c49c38cea3394318f2c8edf5226cdc4. 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/QZK6N2261013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890d430f19f8ff3cbdea9ef7e78396074e85550df6859b645d72ea1f4ed93ffb. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZK6N2261014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03cbcd772e139488ac974e192827c2e648a8c0aeb87d65c87812a57f44475482. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZK6N2261015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba45f6da470fac372a9ebeb21ee08bcfbed638d75d7b95b5e944682ca7be3581. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWY2349501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce1d7a2221346d72a49d3e6609e0dd92e9b25676557f4b669304056c2d50f49. 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/QZGLM2467693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e4c7c6a4e4e4e97da8ef3de4803fbec879a0d8433d22e60309151e55596ca3. 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/FR9W12419438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa835fef411016099a802d2d5e8915a7e2e4f61bb3413320eca87c8bdcd83d9f2. 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/FR9W12447621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b0df6c5f54c22190364837538b70f288e2b9ef6a7038cad597a11a571c6c10. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/FR9W12440074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac090dddd10f714eaeeb895056aa95f7e3b72aa2db0885566a6fbf899e49686f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FR9W12447622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f1b92a7a82a268aa60ed5664f69958613e5bd4a339b695d3a3db5b86b5e1c6. 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/FR9W12447623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b3082cac72169078a78276f2f6d9271edd93ee97a92896875d1ce4f4b1a877. 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/FR9W12447624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da6ec1e41ce8156aa05ce23f8ead310eff0ec70750df727f42f5e98385aefa0. 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/QZDA62389970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba45f6da470fac372a9ebeb21ee08bcfbed638d75d7b95b5e944682ca7be3581. 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/QZNWY2349501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02d9d27b0d65f4cbb8269a9f43f9d323af93956d1f56e031379a04b906329aa. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FR9W12447625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69021d760582dd546a0f763990a546002bbbf1d696063088976f9548c81d1819. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR9W12447626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafeb45fe37d343a209f2463decd89c24790976236caba4d790c8a0d4a1c790fa. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FXR732508251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663f8ad60b68403304a3aa5156b8332a1b25a3107d59f34b115ae0c3553759a0. 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/QZNWW2577378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b13c14ae4962c78826ae31ed14a32a9ecf83e0eba0eac8283b4741ee166bc40. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/FXR732508201.