thumb|An example of food eaten on the International Space Station. Note the use of magnets, springs, and Velcro to hold the cutlery and food packets to the tray. Going clockwise, items include cheese
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 0xaaeda21722f964c4a627af9b393f0881cb908f3b01e628f28f9609522b074e7e. 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/1a315c1e-faa2-4d82-bf27-388aef2be673.json and https://artists.proofprofile.net/proofs/artist/1a315c1e-faa2-4d82-bf27-388aef2be673.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 0xb3f56efc01f39b48409b75e9392351e897bd5bed6f24c09be0731e9b1ef30375. 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/UKACT2060754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7abac7fdbc4b8ff6ec3e80381cc06f5c9cebdb40f68b500ee1387f23b4a877. 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/USLZJ2027351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624a7e2c95384d2e29130e7567d4165a8bbbf122b9e90b0411ce5062cb592863. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T16:12:59Z), 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/US83Z2102278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7d47750417d740ebe285df14eb54f7b497c4d0cc7368b00fc0fb29b535e9e8. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T22:58:25Z), 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/US83Z2108931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72817f1f451463c872afc28400df1f692563622e761ac780c1fcc5bc7515600a. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/DEY472176990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf1f74cb67ac3c1afaa767665068556572aa8198d69546a7cc5a75b977bf00c. 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/US83Z2147209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b594a7add4fc5e0cfcdcb4db76b48d1d8538a875b9ea0588427ef0cc1998bf. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/US83Z2209251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75349389385001e2af86d864fdbe47ab01df394a38f84a1586dc714b14447c4f. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NLHR22200651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367223f883ab8d69b7a65555a0f412582f18ce62a194217558d630a021674f90. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/US83Z2319953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c08727ccd6c949ade4beb74fe523cd7c113d2b2041f4bdfddedf9f2cb14abd8. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/US83Z2319954.
Cycle Twice Remixes by Niconé & David Hasert and Kosmas
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184db6d14f2537a3bf69b28604a0a8a66b8672091558a1cb8342351e9d18b32f. 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/US83Z2328945.
Cycle Twice - Niconé and David Hasert Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb26a1522cb69ac2a59b4bf6516bd2ce2b357605455dfd4843cffe2ba986c9b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US83Z2328944.
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 0x5a14715b66b7999d77151ddc2352d4fcd50ed28cc1045d326e3f1596a31d7312. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/GBKQU2397937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3311cbf2443a9bdc4b2891f8a457b62977c8e157b7468eddc5eeed7141650b4. 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/FR96X2462393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2fc9a956e808e1380429caa12c5d60e8bd9ec2ac3a54d1a1e48d74b487a62c2. 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/FR96X2462394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c2bba7edb5049f7bd2992612a61dab431f5758d64d1cd22c90393bdbc7f6a9. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/US83Z2483944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ce9f679b85f198bced3a90d86f1e29e370a5f8c3f1c9cbfc19e2a8112fbc01. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/US83Z2496986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf000625b6c04c11e51c87970f006b834fc63ce46d45cfffd00b2875daa5fc558. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:18:42Z), 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/GBKQU2527731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ac05482cd5757cc7e982658d5e11aa7256565ae4446ca58c73e4fb019d91478. 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/US83Z2552369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebd8815b6c9d4eae66d2d64263041e5991c18e56606b8fa12e5eefa126c7d5f. 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/US83Z2130123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ff9052d2b9029f0a6a10d64263ee138948171a12b769c08926a665ab0b9860. 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/GBKQU2064608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b922d753404baab6a8d84d433c1922eb33a0276c577156bca7baf579c1d72c. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DGA082299109.