Sobral may refer to: People Sobral (surname) Marcos Sobral (born 1960), Brazilian botanist whose standard author abbreviation is Sobral Places Sobral Base, a defunct research station in Antarctic
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 0x75c45c2b91bbb5ca8f110a25ada502a9c781083729acd67313048feab1d71f9f. 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/5ca2d0c4-5159-4a4f-8c97-b0cd1c1a9fa8.json and https://artists.proofprofile.net/proofs/artist/5ca2d0c4-5159-4a4f-8c97-b0cd1c1a9fa8.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 0x84d33a5942c0b23997cba02146c5e5e7f4489457e04c26d4ea04f6adcd9dd2ca. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QZHZ62004343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef58ffc33707b7cc4ebaaffb1610d86246aa7f61b5a52ee77885895703b62f2. 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/QZNJX2110847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422a241b6f1dc5c6012752bb50624fe183cf479c4ac609f772cb1d23b902386f. 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/QZHZ52208323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ba4d408815e9fbcd0fd9be3e68bcf3ebc4beeab417a85cbfa69198e8716842. 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/QZHZ62267867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c8b4772d8d9232ecc1b5ffd3c0abfdfcdf621a529050e184cb171fd7550ea7. 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/US7VG2307972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf60d805e8d53f72d389893eb9fc64006251f15cee959c5a009e65524f415232. 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/QZNJW2327447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe6ba63115cf92fe769aae390f40355dab5b8be8a34e9835e230ed6f2548133. 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/QZGLS2065751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x214316251490bc7d65b8471efb5c94f7aeae9f6382fdddbe87980abe4aabbd7a. 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/QZNJV2022724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bf7a39878110e75ba10819f847a093036bdb2cb56ac3728c8846907702f0b6c. 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/QZGLM1924842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33cb7059f3cd7ef095b2c560cdea33f700973f50ad5a9b0dbf655c0282d849ef. 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/SE5751999278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbcf3c7cde6fdcf4bfe406f79058e0328efc4248a5194b487c189ccd3418ac0. 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/QZGLM1924581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33cb7059f3cd7ef095b2c560cdea33f700973f50ad5a9b0dbf655c0282d849ef. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SE5751999278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79b0d6b5dfc370db5f085d1e3047b468e247f94155bf31d789a73b8ebf218cc. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/BCEUW2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551af5648c5d7f2049dee6e74343f29004adf7da578dd07326bf2b41e43c8165. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZNJV2238265.
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