Lost Years may refer to: Lost Years (film), a 1911 silent film dramatic short Lost Years: A People's Struggle for Justice, a 2011 documentary film The Lost Years (Gli anni perduti), a 1944 novel b
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 0x2daa9407bf3327a174bffe9c8260a47bddfea5701cc7c88f34a28f3867300214. 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/8bd84dd6-46a1-4bc1-a35e-83333587d9cc.json and https://artists.proofprofile.net/proofs/artist/8bd84dd6-46a1-4bc1-a35e-83333587d9cc.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 0x972e84b9b4dd8e8bbd89ab638004a54a7e315963f89e2397741a7969f25e58f6. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USQY51284761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98bd68dfeb1d50ec89949fc40bff2de641209e909af8d0649eba146f13c91bfc. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USQY51284762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3580ac447edcd5f7101e524881d5476cec583206dd356535ba22fdd2ee1c889c. 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/USQY51302959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd254e1696ceb4ac6bfee23fe6174d16d50b80af35168cf2bfb2ed8ad5e89135. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USQY51302960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20bc225eba2c2e6667554eb78691a5cbee85539fff5c59a093da08689da56982. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/USQY51302965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73afb01b257661f07af7ad1df72c8e0ebabc9419429cf41302b1ee4394b356c7. 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/USQY51302966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9286bcae79996eb7a6feff0691c708b346e81216cee3063ccac21cb2b0d4833b. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USQY51302968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a6898d52e05217870e90ac4f3fcb8b9245d31609ff4db6479df6ec076eef5f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USQY51302969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d9cc8109e288e198d48b7cded7c6926f3318a0892874770d3f85550975a3f6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USQY51302970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e262a36d55f19521910bbead243a3d6816353c3c17b6e0239183985baf6dbc. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USA2P1367866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff43be079c1ce947c4f74cb33804ee8df40b821c383c9d5b23c0889a69d7e291. 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/USA2P1367867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ae22954dea3f395c1f15296262a473be3202f5bada0a9835670511426467da. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA2P1367868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5d76331538a0b1444ec4e2fc0c42d1acac527e9e58355c06a6626c03431cde. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA2P1367870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd507e46b57c1198def5dad7b70879833bf2210e39f7b30cb5f9126dc6ca310b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USA2P1367871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3939ab422c565a5a8e57b20292a51af119e3738cc8e6984a201c6391d4150b39. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USA2P1367872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0946a8dd7e0ba49ea4d949d077bd803b04a734cca376b8e0216f37576387d697. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USA2P1617564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d1933a5258b608cf2765d66c6cf6ba433801df9b3bfaee729ec1f923075e53. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA2P1617565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b01c988924a284725eef4fcfd4499b0fdfe30bd15050e2ee4c44dacce454ea. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USA2P1617568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576eb2d5c0086d18d3214bdaf7da763691433bc3a3485fc9f44a1c1f88896e68. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZES71941759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x720148befb7c1825c0f229a02d8e24a9a9a0706ecb2653c171ff289d390efa64. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES71941764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524c1f452863249a57b8c3ea868d745d71964dc33c6c919e33909c59bb26a0d0. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZES71941765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6ce291f23e7ca1b18744cfe53e9cfddaad5333960f8d7f4c71f5a50e56021f. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZMEN2055250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211011a24bf302c53cbe50d57df0a541670991ba5f08b7ab9bd665502cb54d70. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZES52127444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8709c93b83a0337ab0f629962cb3d097ee07a86111c9cf1c59640e9dc06cfbec. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZMEQ2109954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe7b01e4f2b961757ff42269c59c4ae33eddc4430918d7519de7c7f580c3117. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZRP42384426.