thumb|upright=1.5|Ossia example (2nd bar) () is a musical term for an alternative passage which may be played instead of the original passage. The word ossia comes from the Italian for "alternatively
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 0x79cb69363567bf2adfe38c08ca505b25d087467230e88656620fb766bdd27b6b. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f51b3ab-3165-42f9-9b57-c460125b5096.json and https://artists.proofprofile.net/proofs/artist/7f51b3ab-3165-42f9-9b57-c460125b5096.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 0xeb6baea5347f889ae2e0a3cc8b3b2661eb67a11c5fbe019f12dc770b6ef7f341. 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/GBQLP2300049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ec7e406e4d9084ee2bebdad09919fb21d88e64f31dc4c86becd298e1be57db. 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/GBHLW1900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291b614d1f2eea5ac8516c112c9843bca35eee5b45ef9568f2240894fd76fd0d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBHLW1900022.
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 0x9bbaf4e7226f0c4ee359bd1819ea362b5935480c350ad195ecdcb1caeb37e93e. 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/GBHLW1900025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d692b6c0c1d33bcf9ab2f5a0f511f3e4dcb187f157fe8b289663cb93e0ad40. 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/UKGTM1600110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b28256cfa20d86390f3f71053b201397b79b3391c25a7acf9971de57a83a71. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/UKGTM1600097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7946ee4be8302a7825f483128e71fe06cbd4e2950fb29646d65f71468e41379f. 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/GBHLW1902604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213b0b7d857f652b687e37690ef34a5a6029c5fbee71a7d562e6a10e907e4b9f. 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/GBHLW1902605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3770f74706a21ef953dc0732aec5c521d88f195aebb2bbe5de9b96195d50b05e. 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/USNO10154601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71048d627801c232c0c3466fc29b58c8a8ae88a4153d21bc46d6b6f3cdd174c2. 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/USNO10154602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8590f958d6de61b78b4a21c4dbd62213e790573b40f6045f5f462017f6dd63b. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/USNO10154605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a7a1385774784eac04964b93851a911db0c7f8199fa1c26bf2fae1885c7753. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/USNO10154606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e797aef2fc0a1756dfae6d8b7406f8db20709bf57a54e2fb7b01e233d29d82. 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/DECY52301890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd70beb4ccb7eef9738c753ba30ba5b884b365998405a75a6e03f841bbf9a406. 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/DECY52301894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3199991f763b756283fa85275ffc9988228d66acfbb6c89cc10976a2dd3f2a. 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/DECY52301895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34392ad95a39ab1576303f6e57ac220a7a5876046c555877b2a7480a6b30616. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DECY52301889.
RADIO CALIBAN: BLACKEST EVER BLACK "SINGLES" 2015
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317a2a1cce9d38c579e33369a6f08d9f83c1463802d0ff028aaff17f94516f1e. 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/GBG8Q1500258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208ee19fe0313c7093755fb11f83d4af67dd089eb0dbc365e700d9f73497dba1. 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/GBG8Q1500318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91275202a422ac3e0d91a03180b35fac6b012683a66ca2286abc6d2f0c15a6e4. 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/GBG8Q1500303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fea6b17b33dc969a21b03c4ad56f92d0ce3511839be930da84d7a1b9eb6b40. 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/UKGTM1600103.