Sierra (Spanish for "mountain range" or "mountain chain" and "saw", from Latin serra) may refer to the following: Places Mountains and mountain ranges Sierra de Juárez, a mountain range in Baja Cali
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 0xc09c8be1a6d4ec7327f05b81fe1ebf28d65174df5bc6dc333a7976acbd08024d. 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/45269f4f-b22a-4eaa-8c97-42024e5a77c9.json and https://artists.proofprofile.net/proofs/artist/45269f4f-b22a-4eaa-8c97-42024e5a77c9.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 0x3327d38196d90992a6a3c476057cbea031f1dfbf42868c2a7662e945a9b620e2. 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/QZDA41820588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a0c221c1c02f70aecea9207ecca70b286151fea40df15536e9bfc66a5b531c. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZDA41820590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2399eb5c86338f6d82710790871b4d28d855a8e2eee8ac5284a278f72cf8f015. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZES91803968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ce418cff1d46cbd956e6a88e474a2cc68ad1a61e6aefd740c238f8320d0694. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/QZES91803969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d98495ae7f5cb1f23caead85f41d8f8f259366827cf9dfdcf8ac58dcb19c754. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/ITB002000525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe990455aa2ea72200a26612f8ee8d4450fbdbb96a81ae5585ca544dc46f4be07. 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/ITB002100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e1e2d4cea3be35a108f8aab80cd370f0cfdba337611594559c353c41785905. 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/ITB002100319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90eb51ca9446220b4fff84acb246811219a27eeca4358f3b4296d9273a18d49. 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/ITB002100320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3157ceb30632ba3ec5a2f10ef3af81a0ee8454c76a38cd007220912c9e8b2cd1. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/ITB002100321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565c5b31650f978e34c8ebe7b630d76bf199f05164e805589356eb8cc7bfca6c. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/ITB002100322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7241ce8927dd17d2eb16f0d5a64ff7d7a2954b04118a6ddb53730c3e2dc72c2d. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/ITB002100323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f435d7b7c89d307a24878dfc36369707fa8659c43d0c6f1b5843de654f6862b. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/ITWV22200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaef191f7e4a0dcddba93888199637cf309dd90c36058c20d9ace6ae7ef3d42a. 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/QZWFH2334663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7bf1c2cf82b9d4d3d0bdd4fec023be86277e0b7baa64012dac2e1d94694cb0. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/ITWV22200096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde89fb0702afd9adad0ee7aa4ec28164278eee5805f50893b6924e69be9f3d8e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITWV22200097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11c81918941f23f21eda52086e1ac63feb40390393b4196b147a50276a71360. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/ITWV22200099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b75d4e510da1e246a4d6caf3c1b87ec98d366705caf99f15f38272961f35366. 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/ITWV22200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd80153d5d8d518e1be8dcc5fb9905806a28af31ecbedbc9d1ae9c12b5efef768. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZZ7M2587525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7d5d9cdf300fcd8bb5549215ef24f4011363659e90f784facacc859433692e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHNA2182200.