Emīls Dārziņš (November 3, 1875 – August 31, 1910) was a Latvian composer, conductor and music critic. Dārziņš' work bears a distinct romantic character, with a strong trend towards national themes. H
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 0xe1c77960d923239647189caa7076c911d115b715f988dd803427c6516489cc8a. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d1547ab-441a-4055-bb9d-21b4b23b0f60.json and https://artists.proofprofile.net/proofs/artist/8d1547ab-441a-4055-bb9d-21b4b23b0f60.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 0x55f163c87c01a45fe791b0aa20045e8b554d4ccedfe17e70db763af2ae6f5d12. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QM6N22040005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfb62ba38a14220b3740372c38428f41ad0495069798e9d8a3d85582bf945dd. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QM6N22040007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa7b52dd310cd57639c83a5a172778abe6951dc4e10afd16ced98060aae4f3d. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QM6N22040001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb15e80be5d770d691e84205aa45177f502725d098c7de848050a13196a28d2f. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QM6N22040006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbf740e3b1e802a051dc2cb0afc107580881235b376f3fbf80d0c530056b423. 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/QM6N22040000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58735e3c85bc3117db5eb43a7208be24c77c7883983adecbdc33a33f47dbb15b. 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/QM6N22040004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbdd07b5079108c3fb717273815f9252a92e60ca3a16d25edf93437164bf43b. 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/QM6N22039995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342da8cd81bbc2c7573aa79bbc6ad791e04cb3ec628b3681551aad217e457b97. 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/QM6N22039993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ccf9f489a51f49b08be3f9abe364ed5cba3d834b98b49fc873f87a0c116334. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/QM6N22039994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d412c511ae32d4f8253f37269feaebcbe2d382b75689bf715bc192cc3102aa. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QM6N22039997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea8bdfe72ec7a8de99a05612a188696ebf7686cd62d040d2cbf8bdacb1f21d7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QM6N22040009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74442ae7f380981cd5ae618ed01897ee7248be6b4254182be50ecd1b0ab0e3b2. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/QM6N22040008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d8a7b9b7f73154d8f3d7fb5b1d53d44e2e729d9d114a2392eed5a2da2b36c5. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QM6N22039996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30eed38d195d18da067db8db4e3dd30d8fa3088a8bfa93ead8ff7c82821f2f57. 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/QM6N22039998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0d25cd190049fd9efa82d3b4975d5bcee39add4c6c56b74427422aff26bdaf. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QM6N22040003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30f853e49679440c60f2b5e6926fc767a97074154f16d49913b6f01ac15dfdd. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM6N22040002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5b916dc9bea20cdb05f9a5077ce22563dea8933159f4b006232b3339672fa1. 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/QM6N22039999.