Justin Steward Furstenfeld (born December 14, 1975) is an American musician. He is the lead vocalist, guitarist, and lyricist of the rock band Blue October. He is also a member of the band Harvard of
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 0xa522f43f4f8e5ec23e7f4ea92716f562b6593d6657436073c32efb688c73f1be. 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/0fbc00f4-d73f-4939-8ef5-160c8199b949.json and https://artists.proofprofile.net/proofs/artist/0fbc00f4-d73f-4939-8ef5-160c8199b949.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 0xba8fc9187117a2b9a469b226a1d85aedfc1ca5c9babd18101ca076c386e684ec. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USZCN1400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04c66c7dcb6071f460f4a2c388b1e32cf54c1c44f070d927ecda085464e5756. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USZCN1400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0e556e11ac0f670f79eb7dac8c033e012c44d3e948a5267cd9854b61d6b3a4. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USZCN1400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45371e380ee9d6d2c6eb7c33b6efebaf36a01adab357ec9c89a0a1422c55fa4. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USZCN1400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56b8271d4941dbbb9ddfd86f3c8d8708a609316d9a4ac13ab9f554e6be3dd8d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USZCN1400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4470fce39b5ffde679de761da84ae53c77cfa27ef66eb7e427abee935dae0209. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USZCN1400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4b02d29cf1ca65acec1f81d9d2388441796d8ebfa1ae96bf3260ead191f4d6. 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/USZCN1700026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd03582cce1ceaf81414aa29a20c2752fb4e339515d0b043068718a9dc72d0a. 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/USZCN1700028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6a92303b15930da69424b0b5031f65180cf26cf118d40bc33079bef14a68f3. 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/USZCN1700029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2aeae3ad3ffe74783eeaf312e90431b7c7b696c1a61250e1847f5d7f088e97. 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/USZCN1700030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1992846fa3894a20e362af793762c724431b8615a2d3b28a515ccd5928c9336b. 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/USZCN1700031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4006b88bf6062e63ffd129634a87fc6c5524764ddb7b5b6587cdee629fb2be91. 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/USZCN1700032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830d1f20322d11d767ab64bedfdfb4af0f3c081f277bd6143d8ba871631a6d94. 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/USZCN1700033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541f03b059b0ac075609fdd74bb3b9f76f01552b0bdb3e1039a6b726a12074b8. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USZCN1700034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0b0bd066531e23736dd3ebaa44442d197e0cb44470f4eaa77821f8e025c21b. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/USZCN1700035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14d338f15170db47744011fc0107eb8c0eaf5b1c1010783e11954a57db4f28f. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/USZCN1700038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd264e7e471e99ee2efa4f66946b8fe1e3b8ee72bebb867323c43d8afbf4a9f4. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/USZCN1700039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f13c113230ee32091f82e5d2adf3f81d7244366c35fe210226ca276cba3ae8. 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/USZCN1700040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83250450b557994b2d6c707be29b4f7607164f6d7ddafb51035ed9c7b36d0f9. 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/USZCN1700041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dec1dbf1ce1a873e27f74a9f4dff2f8a0603126fd4d03d1d8d937769bf4afbc. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USZCN1700042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2221d5f7334b0bd85a97c3f5f15efb0cefc1c3e435a4b49c3cb84f5dbd30b50c. 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/DEH841300154.