A , literally meaning "to come together for meditation" is a Zen Buddhist retreat that is usually less intensive and of shorter duration than sesshin. It may comprise a short meeting, without liturgic
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 0x3e2ac373efa75bf3cb0a18aca829ba4287c04f92dbd106b9703f410cc5647d94. 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/83ce74b2-c602-49a1-b71c-c459f1b12832.json and https://artists.proofprofile.net/proofs/artist/83ce74b2-c602-49a1-b71c-c459f1b12832.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 0x7b5968026dd41613c694b5f97ca46bf0604d6523eb033f13f5ad6265f06f9971. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEH742403058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5af0dad1c69fd466f7470a59d2519c12f447745a8b8449fd59f6b4a157de71. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEH742425955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3361792cd1e7f7a4587d8fea35851db07f0da6eb687f787928d2fedf33bdf48. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEH742410458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46fe6169bed0034266e4f4d2267adba9566853417d51e3dad7b129a79a1b2d7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEH742208954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5467b333446ab1ed73d3340287a2d42ce4bb4a1ccfe0e41d1d465451dab3f11e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DGA052451550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781f331c4c244a1ea95de00427c0173242f0a6ff7516b519ab797598fde6f626. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEH742202471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c43c903ab808b105f51f44d83454c2e26f8e0e2eac01026bb428080a3be311d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEH742214314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77032943bbb9fa6916a57777fe4ec030fb352a86ad02083c6a7ff602a4365e0a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEH742204207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8bf6aac866050e4f357a915763f67e3b5c136ef688384bbf9c837b83be8780. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEH742206443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503ba8c20625b9f5e05783e021d42eaef031e994ad03dfa586163afc0e54c75d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEH742430019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5e174b3867427ead9d2e48bd1b2500f91354b6d6552c67010621c4ab4c1e55. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEH742430020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d7422e873ef07907af689a0d0207a0ac1de722612e742a94c49c4aa1717e8bd. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEH742426868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b215f3df90335e9505457665344673f544fffa3c72a3d7dc1219dfe6f81c97. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEH742432926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552dcd0ccacf1bf557ee85a8c5664f01efd1409e615ca448cb68f887c675f8c1. 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/DEH742437167.