thumb|250px|Chydenius in 2009 Kaj Oskar Chydenius (16 October 1939 – 20 April 2024) was a Finnish musician and composer, probably best known for his left-wing political songs interpreted by various ar
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 0x0382e00270b7eeebf97a503a7b431a84128fdd9a141affab34c5adc78fbd576d. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27d1fbb2-c40e-46c2-a94f-c94bdbd47df7.json and https://artists.proofprofile.net/proofs/artist/27d1fbb2-c40e-46c2-a94f-c94bdbd47df7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lastenlauluja Magdaleenan nuottikirjasta
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 0x1387fb04799ffb7ca93c750e1daceb35bc3ab1cd2bf328adf58f0096e5409b86. 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/FIWMA0700974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbd23430d0d47a1360ed7eda3feceabd250fa0beb01e4ee4acc81e8393e0d92. 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/FIFMF1239622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d07c6be3960fccd0661cb6bc47b2f3de8ee0ea9abee61783a900da055c6a63. 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/FISBA7300277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f049d8e9bed8c44f066e2bd2e8fb1aee40aa2f0b5172cdfeb81f33a9bcc5e1. 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/SEYOK1768989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67b636e60115f481f8c62d9ce19322da01a60feb68e133e121ff8417107bfcb. 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/SEYOK1768990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e979148578a6a9c42066bb1c0bfb872531c2f174bfaee64aab75ae394720aba. 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/SEYOK1768991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa815b887523b9d99e02932001cb4b3701223a0c3f82e71222164fb66fe2b0f. 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/SEYOK1768992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4cee9e5fb1501630ace244725ef330e097fb653e8d77b17aa1bd5e8fbc71607. 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/SEYOK1768993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888d32cbaeef16584020fa57f870abf1942ab1907d20d4c0311f7b6975a87853. 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/SEYOK1768994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80dbd2d2698b9b7f3bcdf9157eb5b440e366b37187c5c3f9aa4e9fcaba0e9d10. 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/SEYOK1768997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae062917feb17500df43ff2d66aeeca777c3580042f132231b88951616720e5. 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/SEYOK1768998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7bd37cf3953551c501fc054020d243d3aeb49e25375da53d1715e0f934a300. 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/SEYOK1768999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfdaf7ab1ed2277e031ec366e30879b45a4ad024bd9826e154fafc39a0ccb00. 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/SEYOK1769001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea167098b5aa8c9aa127a973fec8e15ed0922d3cf0c2aaeb45d0c9e9db8805a5. 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/FISBA7200124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b4338c611519317e9d94928ece684ef1433ebc9b3fe113a80c4e7a26461335. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/FISBA6800211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7174424dd1fbe5cdd80988d08c7d621aa00f5d3b95d3de7f54b0c997f143d9bc. 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/FISBA7100297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42354422fc41688888dc625eccf9b0527f3ccc3b56bda99994870db7be0b7c70. 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/FISBA7400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf218d510536f77f93afea7f68b6046b5dc1981ff2fa61161244ae04e40f18a4e. 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/FISBA7100154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3e33e0ec551a58f0c2c0961753ee893f20f499b72bd72b43be22ae9437e609. 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/FISBA7100157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d4a915a060043dd278b6b37cf45262dbd9046ab9554933f3ee865d3150e40a. 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/FISBA6900301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6230982d7b25b29530f04b0bdf7b2bd9e14f05556fabcded3e3d2c8b693d7fde. 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/FISBA7700547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7c255bbde6df73f95b509839fcadc74aa0096836b6148c60596c2058b91b02. 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/FIUM71202137.
Krokotiili herbertti (arr. T. Ali-Mattila for soprano, baritone and orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cc08f5d09a60aeda5ea3c5333a4f5d0df756d613e8254df5d78d0d9fba41ed. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/FINDE0500046.
Janojussin maenlasku (arr. J. Tikka for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423807e2529a19b2c9ca221a3955ddc06b7d7faee8a03534cb0c08a0ca60dcc8. 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/FINDE0500053.
Hyvin hiljaa (arr. T. Nicolau for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67209d4384a1322c28593f5c238fad88d8d0b7b9e40ecdc389028c41a169abb3. 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/FINDE0500055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db495785ffd602d45501d3e219c5f1733e1532745d5f4d395d88fd6123f3c60. 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/FIWMA0300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f9e786153b4e50cdc3d754b367d536e6f596a688a3c9ec148b5c830427df04. 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/FIUM71100150.
Choral Concert: Yl Male Voice Choir - Linkola, J. / Schubert, F. / Godzinsky, G. / Fougstedt, N. / Lindstrom, E. (Sulle Kauneimmat Lauluni Laulan)