thumb|A modern Japanese kotatsu thumb|The underside of an electric kotatsu, with the heater visible in the centre thumb|Edo-period kotatsu at the Fukagawa Edo Museum A is a low, wooden table frame c
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 0xbc23680552762592997f8e7dfce8df137557260909f22ba7a2844218160ebc1e. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63b2c7f2-2915-4c1c-801f-67d69059a623.json and https://artists.proofprofile.net/proofs/artist/63b2c7f2-2915-4c1c-801f-67d69059a623.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 0xdbf3cf5e3bdb8ce36da9b68f9ad29a68e3bc51895fd5b0f1c8f55d7cd34633d2. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/USANG2258389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f402867a05eb68b95e38da9cac2c012157b7c7f9a63b1504e0100fe8c09616c. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/USANG2268193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1200cd3a8210d2bbca7880fd7ddeb00fa98b6daed20d7e78bfbc96625ad9563. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/USANG2285550.
mortal with you (kinsou no vermeil lofi)
fukashigi no carte (bunny girl senpai lofi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781efa9f379565c59b257ff0e847f6d445543ddbec7515a47e698deaa8807396. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QM3DF2264632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737ad12f46e82711f09f050391fb2a6f7504a160334ddbe1dbcb570d3a1d4f6a. 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/QM3DF2299396.
a town with an ocean view (kiki's delivery service lofi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0919512891e0884e5e73d2c33a4bd6ab162166cbe67c709dc136d5d79071b70e. 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/US3DF2494299.
path of the wind (my neighbor totoro lofi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56222740d691b87e94438dcc70e0f722a01793aa3d75e5a2b4ff64743120202f. 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/US3DF2494302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2d1af88b4a178d2b81efb9d0b6180e92e4b8477db3f039944802eb1d82dc5e. 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/US3DF2494301.
merry go round of life (howl's moving castle lofi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8ce077c2d04e9c1ab97b71c8a5e83b9666d7288120db82233ff140f6826917. 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/US3DF2494300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba03449cf67b6d54a1c38a1a000e7e54dec1d6da8fd37d20c6f94888ac8f0541. 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/USANG2419966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0809823dcf7f6994c7557059f1903b3b6dcbf64d5592ad20cb79f1966721fa70. 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/US3DF2515284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99fbf8baed444baa4af20481127098c8ecc36c48d23ed69c59f88f7e464ac04c. 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/UKZGC2301833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86168ddcdfaceb501417bcf973a8cbcde672fb0bb19dfba7d6d14f5cb93fc44a. 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/UKZGC2301835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a74652dc8b4eb8fa0fe6710fcf375fb2148d724fd995a5337ccdccc3f61f35. 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/UKZGC2304284.
Innocent ~Mujaki na Mama de~ (Digimon Frontier but it's lofi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ece88d17ed556b11af5417f9888e2a43baa5b7678c1cba8fec1ef0e4266491. 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/QMANG2227492.
Stardew Valley - Night Market Lofi Sleep
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a9ff645c24371697ff43b842fc2a945cc0db7cbfd90f0e6cc11063f71e3ff9. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USANG2429121.