People Darwin Kastle (born 1971) Magic: The Gathering player Leonard Kastle (1929–2011) opera composer Richard Kastle (born 1958) pianist Other Washington Kastles, professional tennis team in Washing
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 0x7d3989a9f5876766ca0903761de9f53c55ef66cc38e1d9837bb37bf5927a1562. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b6a10bd3-e419-4a2a-ad9e-40c080415345.json and https://artists.proofprofile.net/proofs/artist/b6a10bd3-e419-4a2a-ad9e-40c080415345.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 0x083539735a18026202a022762276bec171341525df203511b6b4e70fb7c79a99. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USA2P1689820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7b9083c409092e619d838a73654dadbf254b76e043fffe917ee03d5cf24aa6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USQY51354139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9f289434861e344a23d43c1edf4e30f92c0bcedb6bec254d699bcbf7ba012e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USQY51354145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdce823bf4066351faa67c512473eb88918e909440bcb33d9c09f86d443205e0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USQY51354146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea60b1d9dd6ad22a33da07450b70473caadf119800ee206563e885aa69fd90c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USQY51354149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685c7161837f4159439c969ca839258e8cdc525b6d220420ac4c8b4958d844e6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USQY51354152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7114389cc88207fc1fa7de3ebad9575a0fd5239470185675c7d3ba4392b32b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM42K1964764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9393fa9ca6047eeafa1cd35f4fe2f274e3b08b04380206dbb60474a0d1e8a24d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBM6E1800137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d14d4593887f056f21d27dac3afea2a9f4a54c5d4d0a9ab28e763cb4613bd99. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBM6E1800093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eeb97f1e7fe3bc84f4fb5bc4f8c29b42f87ea00e7eb86d12083807e09339aa6. 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/USA2P1690156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x181cbeb2e533932015343baab045424f6ac9d448d4ec5bdbdce25a56b209f931. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USQY51596045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6409fe5f4209908b4c9af92ce840f0487f409d716c46efff6f96a7938ff93b0b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USQY51546511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3c749b1fa059e3a5556d742c87bae24cde9f3b23b4f21f647580d9b7c6ccf6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USQY51546514.
Anything's Possible (feat. Lotti) - Single
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4875eb4359c5350f9333d7979c180cd5b61307a7a936ff4d2f84df259a5c37. 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/USA2P1438722.
Anything's Possible (feat. Lotti) - Sweater Beats Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43cf5f2556426234d3bef8475bf341cdea59cffdc972a4c02e0854a8e62597a. 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/USA2P1438723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b3419ce16c85e324da693972fb47a2fdd5ff4dde3143ff9dd4f242c551ce91. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USQY51347523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647b38b2d7462759420450eea6233f21545801dad3d1d35508c7a9b3bd81b038. 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/USQY51336939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b2b7ac8e303e5a369e2476dbf52afd379dd3fdff8398965e53725274561b7f. 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/USQY51285904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3775ba6e2dd02f85779f966295ddf48722afa83169bcdfe167d3c638c25c6b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USQY51285908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ab1d58fe08d1b86ab12704af9647a0884ab6e8fc52fb46899d6bb4b9e8507a. 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/TCACF1538914.