Markandeya () is a rishi (sage) featured in Hindu literature. He is the son of the sage Mrikanda and his wife, Manasvini. The Markandeya Purana (one of the eighteen Mahāpurāṇas in Hinduism), attribute
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 0x90540f98ff3076001a8dd6891ce5e97ba541c5ec9f0b110429a56ad7f4123d20. 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/525b9aea-24fc-4c07-b588-e3bbbb91bab6.json and https://artists.proofprofile.net/proofs/artist/525b9aea-24fc-4c07-b588-e3bbbb91bab6.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 0xf8bc9fe070219a57ac2862c5ad64bc0b4fa7e329f812dc08e898ae2701dc51f6. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SEYYG1200303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f34193a9a712c9d2176fc766d9dc014a0136c8813179cae9a1f67cf5fbfe73b. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USX9P2036711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5704a1dcdadd8b65ec7be35210ad46b213403e1e17c55fd507825c878e6b2e2. 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/USCGH2101332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901deb960bf60a0831225d029c96643dd066f042916c585e158ebffc209c8a85. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/USCGH2101338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae924ffa0f741258788f7bf7e3fe66ddc52ee254f66c4b2d6a576b4b15cd1e2a. 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/UKACT2331053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96121f233f7bea15339025df7ac4df502fe45c4d42fb05f379b2ab7b170eba6. 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/UKACT2331052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96121f233f7bea15339025df7ac4df502fe45c4d42fb05f379b2ab7b170eba6. 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/UKACT2331052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae924ffa0f741258788f7bf7e3fe66ddc52ee254f66c4b2d6a576b4b15cd1e2a. 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/UKACT2331053.
Balance the Pressure - Joaquín Cornejo Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0101a57337a2b45afd072553c6006e458b7db98735506386de17ab2a2d67ad4b. 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/UKACT2331054.
Spirit of Love - Joaquín Cornejo Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05d6a41daceb499c05644735b33bbb7e716741ff105f8805bec8c9cf6ed50ec. 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/UKACT2331055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dac7b419b7e327ed15146412134921f638a1603cdfbf13d845398439d8ff062. 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/UKACT2331056.
The Self of Every I - Joaquín Cornejo Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4df084bfab35a823f70ef5e00d0c552cc51a8b6fd3558a4643de5c3b061574. 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/UKACT2331057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x824bf9d9c8534202ecd4b82173abbdba07dc3a0b59d762a364661fd71a59a104. 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/USL4R2509931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fc3f962515e7691be2aac520135f14d4d18c910420ba23059de48b645d57419. 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/QZ4BY1600027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b77d42a073d25ee42ed87e6dfc81b10caabb33db145f2c8dc96a856df0cb3f. 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/ES6102100362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11309a6f0b01cdfcf868cd41ac78e02a7ec4450b44d10033d08bc6e07e2402b. 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/ES6102100363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11309a6f0b01cdfcf868cd41ac78e02a7ec4450b44d10033d08bc6e07e2402b. 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/ES6102100363.