thumb|Grain bins in Cashton, Wisconsin thumb|Grain elevators are composed of groups of grain silos, such as these at Port Giles, South Australia. thumb|Silos in Acatlán, Hidalgo, Mexico A silo () is
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 0x4d5ee372d36b5f86f18ce87cc36cb744d9c1a52bfb8f6d1af5d00a8f14285814. 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/461c9091-cbd0-4324-acdf-bf594b5f3aa1.json and https://artists.proofprofile.net/proofs/artist/461c9091-cbd0-4324-acdf-bf594b5f3aa1.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 0x7b129ed9d7baf6cb10c0ec1b743845b3c372ae7b55ecb35a53e805e6827d8bf3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZFZ42082566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1960769fa693685d79ab9d95986e6bc4aea599872c39e077eb4c77fb6753909d. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZMHK2057304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ae4cd55c4fcdaa392806ce221703b9ce186c87e9de4404653248a59e14dbe5. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZHNA2229694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88358eb8d8febcc8b6910e8aada7b943753915e387aa9b0d4da89152e7cfbf96. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHNA2229698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbaea0e38483b7472846dbbabee20bebe010b602ff5d9ca0ee07adc434f7053. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZHNA2229699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c6bddc6c100501fa9b658d7035add08f2811d591e1bc0302cfd2d835b8ec24. 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/QZFYY2514861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb357159428b0db4ba51dd47ffc62484e4eae94ecbd1c2c7572dfcef57e66f51c. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZFYY2514862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755455061a90acfa047de3980fe43361d8fa4089bc64bdb421e67a934ffa950a. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZDA72537396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195e1e49a832ee05af585f721e9c2cd5bdad213779476df9c2862deeb8f3d86b. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZDA72537398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabfe79212a0eaf12eb58464015321740c0a70460c86ef5a964db99bc8ff6dbec. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QZDA72537400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54351efd88a80f64ca50b007f577560e0e8dd46715ad20b53c498b7763313981. 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/QZDA72537403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc0f1b61f7048cf0667159fd034ca67d4dcc67046df176ff00b844492b68a63. 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/QZDA72537404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecce992f206fe245a9e4151e12fa30ed042c994e13ce45457322f4afdfc67b5e. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZDA72537406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4f47d3043679f37cf338048f2874e1812a747ae3618d53cd0b01a4d9f67c61. 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/QZDA72537407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18c73889602bf32d37f2147059d3920bd84daa882e0bb4129beea654211e9120. 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/QZDA72537408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bcb85f4b4703f3756d19ee7420cc66ef93ead03b6a6c96dea8bc17aa94060cf. 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/QZDA72537409.