NOS may refer to: Science and technology Nitrous oxide, also known as nos Nitric oxide synthase, a class of enzymes Nitrous oxide system, an internal combustion engine Not Otherwise Specified,
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 0x456cd0ffc0917e9ba6fba01d964b03c83f9f935dfb8d31210a221009877ab9ad. 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/4a56d554-4a81-4653-a250-7328a2f5b5ab.json and https://artists.proofprofile.net/proofs/artist/4a56d554-4a81-4653-a250-7328a2f5b5ab.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 0x25d8867e8b4f23788490fa19713c58a07ad14b495ddb5121c466bee12d7e9ac7. 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/QZES62357448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec14b2b27742411b163451be7447798dd0b0464a41c59d1cbbb2ab4b691b191c. 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/QZTB72203235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417f0d2a1deee120e0d4c8178c32077d926573578f92adbc4247c0a81278949f. 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/QZTB72203236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20b4fd267687b9edd08bac339236c0ee53ef469f88d71d04b302ed5c58b62be. 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/QZTB72203237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afdae8e5370874624c49021a91c1cac78bdcb546ebb4e9798ebce614a85c6a7. 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/QZTB72203238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ead0b43ccaf4b02200a819fc2c5461839fd7ac24cab8af9b32be6746500f54a. 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/QZK6H2287590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d70c5c46b29970ec71828bd2b7dd5742dff3d40c26c6cf502822ce1efcbfcd. 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/QZTB72203239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3031badfc789fe49be2080904adf6fa8e4d99c9f6c810b699840ce3c2b8ddcf. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBLFP2093574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4f790c3703d933a655d55ed2b00cadc60cdcee26804f235dac0e24b4182613. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZNWU2459517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36f2d8eb244c58cc43ea55cfe31a43c388edce828a6f5b8e6de8e5d055dd50a. 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/QZHN62400136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ee39632b46c5f9e36a3131d3b68eb771dd57802ed33b8dee6312641ba49a53. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWFR2390267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf52d3d0d98af4e360a74ecaecd2bc8c960f0f98791caea0d1b26035a748f7f. 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/QZK6K2302763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94eab6e5d8c0b481af48cec574518f86ff819e238e4d8fdd4002a2ba336522b5. 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/QZTAT2266250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05eab714a581aa2f4490e11724d3832715197ee4badced1d5e3c826358ea0d72. 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/QZNWW2169624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf352f5f7d3176b9f1ba5980aa65ea65dbb8b2b92fbdd02cdc50f1994c82cc101. 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/UKXN22055631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f57c9fb708b539fa4d74e726cbbaab4ea3859b24218277c8d4625b187b1fb4. 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/GBMA22092401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacbd4d51f64b316c860e350193dba634089316a2665fa367de5b7bb7a12d06b6. 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/TCAEN1966959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58618a8429e150721691d116ba1ba14fc905eaa1e9d4ce08b5d03bf37809f605. 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/UKXN22062011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa790aa3af37403cc1d98a46b57c102faafcd85b247cad141cba97ecf3d16c93. 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/UKXN22062013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cbb49ee2e7de15c8a784b12f10635ab454ce3700980e69fb72139f1a503d984. 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/UKXN22062014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd9b9ba9950496dd9415fe3d9d6a64f02db1981afb1967a69cad71b46feee11. 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/GBLFP2176807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c70b3ee0281112dda780f38785c6b56e628155b4381942fd44e9efd1f763996. 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/TCAFG2089581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8833a76cccad347f13c3445c67395213a6104f3a84bfea81d4f6677a1a8fd612. 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/QZDA72529990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48149a85ea313f3d95d79fe4b07754d093d684a9f824fe614d9e931126744452. 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/QZWFM2400525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3e0c6df55146863f3b52f94ad80afe9d305c4114db1a293cd13b756e6b7236. 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/QZWFG2464894.