Saku may refer to: Places Saku, Nagano, a city in Japan Saku, Nagano (Minamisaku), a town in Japan Saku Parish, a rural municipality in Harju County, Estonia Saku, Estonia, a small borough in Saku Pa
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 0x777fd529f28ef4b48ccf5ac6b6978a2da66dafc129c7a02db17ef62f194ec189. 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/b5b958e5-7456-4a20-bc4f-43d35705f13e.json and https://artists.proofprofile.net/proofs/artist/b5b958e5-7456-4a20-bc4f-43d35705f13e.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 0x01bb19015b2cbc3fc8732ae726af70e0be2a0ed3b6341926c03c1c336ed953ef. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCJPY2329644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2872e3729b5295897b36612d6be1a3e5fc7ea79843baef7e51a976a6841c0dbe. 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/TCJPY2329650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0475bd775a99a469656f9eb95f3d47a2051b09f58c171f51324fb26af9c5d1e5. 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/TCJPY2329672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635e07bf95cf547afa4075e3c85e59f40ea7f8a83de1839d2f292c087920a7ea. 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/TCJPA2463498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8025f5e8f117fe04387e026a050b7431207c693798078c6395ec9add13ab2970. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCJPX2354872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4d3245086469d474ca8cbc0b88520883228dfe680d40918097412855a77679. 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/TCJPW2393019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84dbbf758abba3a5fa2ebc85555c0bf9e26690d299688162fd383edf67486d99. 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/TCJPW2377509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802b351b78b5eb88481e7f0cc0bfee4f29121e846b73cc044ca04653454ac6e3. 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/TCJPU2344798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e12167bb67f3d8c303837dfc4963e51afdc5818b67010f9cbecfda4d8514e21. 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/TCJPT2260656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6739fe677e1de25e947e754948e61803e4ed49cc9d2de481bc0502e93da475c5. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/TCJPS2234636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ef08440f1b4744ffb2915b880e50e1df0ef878f30fbc428f2b36cc50ebc9e0. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TCJPR2259963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9fa5cb98a858855d0315f056e2a13eadfcd2146dbfebc0e4a657d5b31ec791. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/TCJPR2250453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7e0f53ce9c42fb313c6a921d9e6780443dc6ab9da8c922f09a355d92963f45. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/TCJPQ2157584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe261cbdf84e7307eedecc87c0295cf1b15ea084f322ef9635a6314d3e3e4e2e. 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/TCJPX2311195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce700015e3e72fb455575724af93604c077adae694aea02389c0c2d35d6d8a47. 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/TCJPX2311209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c6d80ac2fe911409dee056d66a1ce1bbe3c3b9afecfe00dd1225fcb90e77e9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCJPX2311214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd901726c952b916065c3fdb89d025828b615b85b13217132d90f14ee5c5ade70. 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/TCJPX2360181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2305b1b8846f3dbabfe7d768570fe34d3653bf6648213143691c68158da3127d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TCJPZ2498978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbe28862dba69acc217149b57f07a8f6aa4948af4907b8f84dce2dacd11b9a2. 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/TCJPP2188412.