The Depreciation Guild was an American dream pop and shoegaze band from Brooklyn, New York, formed in 2005 by lead vocalist and songwriter Kurt Feldman and guitarist Adrian Hashizume. Before disbandin
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd274d0cc943e5b8aa305f5e9de255c3c93f76197530e2ecb5c8d62785c927f8e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52d030fc-7024-4896-bfc6-bfbdceb95fa1.json and https://artists.proofprofile.net/proofs/artist/52d030fc-7024-4896-bfc6-bfbdceb95fa1.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969a55ec2cf542443cd9ea93645818b4067f7d3d2176a290421cce9ca10e8709. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/US28E0943102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7b646a52751cdc6240e31a0d7e87ef8dd0e5bb0d3c6fecb3eb2a31dc02f196. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T19:00:34Z), 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/US28E0943103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb17c9865301fb4cc99e592f4766e32497fd92597bb06f3e662ab221f313ad159. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/US28E0943104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9156898ec5c990f7ad18e4c4bf917086fdaacc9de1c0056789d6976a6bfcdac0. 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/US28E1049601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb795254d4575872864dd4d1f903b5d5fa92c65ad9e8066a1426904fc0cd85d92. 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/US28E1049602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace6eb746126c51f229ff03f6b17844e955115234ce179ea7a9b96a8457ce81e. 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/US28E1049603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a749ca5e90f384af112d32e1e6e57a4dca0e40c7b56ec17889ede7e9f3987df. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/US28E1049605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7c2b00f480c770a682d8b08d00ea25cb4cf858b1429d2c36945f25cdefd8f9. 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/US28E1049606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520f7b56555c2e82d82a1b83eb146a1a90d2d9d1ad73437bd10bc2eab6c0e2ee. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US28E1049607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9d5c2c240a91661f047bec0b261188fac0104762a18d0fe41b83c9833582c1. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/US28E1049610.