A mashk or mashq (Hindi: मश्क, Urdu: مَشْکَ; ISO: Maśka) is a traditional water-carrying bag, usually made of waterproofed goat-skin, from North India, Pakistan and Nepal. Mashqs can vary in size, fro
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 0xb9eba7b2e2052f2835509f855e6150bd52bfcac651dc8ef5738fa155554e1595. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0cfb0e9-b66d-4bfd-b8e8-1867db6058a8.json and https://artists.proofprofile.net/proofs/artist/d0cfb0e9-b66d-4bfd-b8e8-1867db6058a8.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 0x501f38cd8438e20cf89b69899a2e5a0346654ef24614eaec1856e491cba7c670. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T16:02:28Z), 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/GBJX32060514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e6e26ac7b94cc90b8694520a765a47f0745e6cec06775fb1f91ffdcd592535. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QM6P42519473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ca8fc9bc1225ab2bfb3967e76bae3cabb28b6f85cf394bd3d3f9570940867d. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QM6P42519474.
Le café abstrait by Raphaël Marionneau, Vol. 13
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000e84a41f5f691e4717da8f3f41dbe392cba6549df88a29eb300e695ea3b010. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEH741808169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56812f1ef6b7b3bbf419e7ebcc79d696609007ccd66ea292a119535d69df7be. 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/DEY471981937.