La yunta, also known as El trabajo or Los bueyes, is a bronze sculpture in the Paseo de los Héroes Navales, Lima, Peru. Description The sculpture represents the moment in which a farmer works the lan
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 0x3b2f2534f20b3c817f514b86fca67b76874b55bbdb7f7795a5efce3855aa56ad. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5918947-7ad5-4e88-b25c-cac72bf1f2f9.json and https://artists.proofprofile.net/proofs/artist/b5918947-7ad5-4e88-b25c-cac72bf1f2f9.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 0x9853e5cb6ffd22a1a62ca284dd51212d81fe5e65a61b095727088ca7b45dcfb8. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/ARG601011419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406469a98abd5d0ca39ad49df1546de12b5c57ac0deb5fa040f6a9afd64d9bf6. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/ARG601011420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f41251a15a2b24ff8932db8a8aa4a859c273eea3fc3b6bf581346556033950. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/ARG601011426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfdbf64a7a3aadbc9c012b279bd7e550e3262ab10c5edbc381b03e6cda4a834. 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/ARG601012990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1587870d50792c3bdba1f4b77aa6247d8c23287a717c5af4fa0f46d141193fe4. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ARG601012996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62896d1de5e4e9deaab1e4e60695cd33dcc06b00b3e270b2192edac08ea7fbea. 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/ARHFO1900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea34359b14eff2f40d12fbe02767e572619004359b682dbe081bc31d9358aa4c. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/ARHFO1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba4d934cea96965b99d134a33c574a260938b6f43fe2cae7a5fd5f7f369ac72. 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/ARHFO2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c4510e6054155b33e8b37267a10c87f150ad708586c5cd061e36126d0b1d735. 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/USCGH2429516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ffae9b411d547ada707ef2e846e193c046d53730d8697561cf805fa7d72569. 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/USDY42481884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x323c0ed6d405f1157a3730fd8956d1dd972dfea93621ebebb2763a7b6bc15c47. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ARTJL2500427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b7ccad5107206836a8e1e7bb705aa885ae6b80923e8311704bcc6b9fa70b07. 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/ARTJL2500430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99234d10a4644be72be47eb0eeb66c0fc9a79e986ff24bbbf31b946af239ccad. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/ARTJL2500449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60af4e05ccbc5919cd057d2b1282cb8c6ac020e1442c700e167b384b14239ce3. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ARTJL2500475.