The Orco (, that is lit. Water of gold; Naturalis historia liber III - 118, Pliny the Elder, 77 d.C.) is an Italian river. It originates in the Piedmontese slopes of Gran Paradiso and after about rea
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 0xf9075bb3c831bb1035a091a4b46c9af67c5977d1b6cba6f3d63444966206e696. 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/59c35ec7-a383-4bdd-9d7f-492da58e8eb1.json and https://artists.proofprofile.net/proofs/artist/59c35ec7-a383-4bdd-9d7f-492da58e8eb1.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 0x83278f0fedf7738adfdf1109293bf6d38e2cffa7e3716a9e50bca472e2f3d4a4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6F2035269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b6c6f986521ca75fc7c6c99161a5a6d2f27a80787fe4067521863114d5bd64. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWU2061198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec33278dc90aae6bbf76b09f76871239f1f76e4ae167992f9406d686d1e1caa. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZPLR2012767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbdd560f415aa40e874163af9c4192488e84bca81d03266e3ac5d91cf74969f. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZES62188316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc61a98c061e499b9d4bc8eb28546c13679ae8e466130fce45a2fa47f8376748. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZHNB2179071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9109d1a2b86ba9ef363ac6b9a346cc86f1d9fc5788ba25bf667e9e1c71071397. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/QZK6M2116984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747fecac4c560174d3a53126cfb4bdc98d4f00711e9958082edee72269888b87. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZRP42170783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9383f9980956c9a51651a2640e6b5ac4c15c78e501cbf969ff4d690fdb5538d4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6J2204361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71067e317d7490a0c1a35db4c99b77f068cf0ad5fec01688de115d303f1f7556. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/NL5HJ2200337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x724effde5d23863ffbe6bfb3b5569c91e695ad1bb86351986cd0204f65d5531f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NL5HJ2200354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3e0687ecc23ae934326771ff88d6296eeb2b4f59ffe2c36492ed7920c1c7eb. 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/NL5HJ2200372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe85e09967a6e4342fb9cf9f4e8fff59c039e3e4cb680d4da70bef7ad79a4a33a. 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/NL5HJ2200373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9c4fab571c55fd9d5140fb47a7f404c91e917018002281cd37c192d78313ba7. 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/NL5HJ2400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374c0caaab8bb6dc9980feaf510c30b7aa5a1145e94803981ac6cb621ee62922. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/NL4U22400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0b32b0af09919d64472713e5d97a6d6f221eb83178fedd8a9c1c6d9b821f8e. 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/NL4U22400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1e8810eb3ce3c511671e5c104ed4f8ff30f1b9d9136e1792a36dcc8106a293. 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/NL4U22400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ddf456662dac1cade00049b5c735ccaffa5aeada2a2fe44899b223a221232a. 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/NL5HJ2200436.