, also called (, literally "duck game"), is a game played on horseback that combines elements from polo and basketball. Since 1953 it has been the national sport of Argentina. History is Spanish fo
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 0xafe5c2b965185a03e425d64f0d4ce0b3e987406227e4f95dc8191fccfdbefb30. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/401bf00e-bc23-40e0-8fd5-ffe8a4b9b1ce.json and https://artists.proofprofile.net/proofs/artist/401bf00e-bc23-40e0-8fd5-ffe8a4b9b1ce.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 0x73fb4cdcda96ccae41f32f7eb1862455f172a2dfbb0a615461e6d1d76d141f31. 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/FRX762200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427f70a4b755d7ca3fcbe025368330f63ed20b5b622ba6c2ff4b993a1f8dbe0c. 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/FR59R2392411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33034ee9dcc70d1a891b7029556076aead3fa47d057a72b3fbffbb094019194. 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/FR96X2378994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15881292027eeabfcd5b7465e1c12544a3099259429d5eb7a961e255ae62537f. 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/FRX452364176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768027173864ac9666b0e4716be5781517ac8fa4a173edbf96943982c46f3483. 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/FR96X2278078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b5565a092aa4bb342873d65006fc45f7a4abb07908d7874ef5c1a3ed2626a6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DGA082307187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17dce99bc2f81ae71a2fc6c9862fcd882c271d7be451d13ad8a91c16bbea1889. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DGA082307188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fb4cdcda96ccae41f32f7eb1862455f172a2dfbb0a615461e6d1d76d141f31. 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/FRX762200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42b0a8142e78d51d95a5e1bf6a4f31a5a346499552462480f4b38b869b759ac. 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/FRX282281418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed4538ba520896ba5acc4c92c97c4588b71e81368a46785c538b136c808ef2e. 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/DGA062235688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc03987caf7d8320741812b66010d5855b1e9c504f2378292167c9e7726b3b98. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:33:49Z), 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/DGA082307189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb33034ee9dcc70d1a891b7029556076aead3fa47d057a72b3fbffbb094019194. 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/FR96X2378994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0234ac24d61532f2ab43de2b4af1f2ffdf63e8b1cbcd4ca44eb287ee60cddb. 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/DGA082307190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427f70a4b755d7ca3fcbe025368330f63ed20b5b622ba6c2ff4b993a1f8dbe0c. 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/FR59R2392411.