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 0x2f844520b3178377a71461b35d111bf29c7241e61ada421de1d98bf4570fd784. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3bb66ca3-2c2e-4039-ba9c-d686217d79c4.json and https://artists.proofprofile.net/proofs/artist/3bb66ca3-2c2e-4039-ba9c-d686217d79c4.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 0x1ed5fca90fddd400c816ae892fb65b59c8e9e230d55542e55c1d36d2b8bef283. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/ES09S1700216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897598f525d67306e5f29783a0347393c288af539cbba4e315389ae6a72db163. 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/ES09S1700217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1b20d71687a95c0be2658014d45339a780ab9eab7c02838b51e31fa511d63d. 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/ES09S1700218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc734ae466d6631756a872d7aa0607b573c06318326e81b70b4b5c04fac248e6e. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/ES09S1700219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e63b05b27c01db208642834e064c371afd75f962d04df72a378ee9432ed199. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ES09S1700220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4acea23475a4bd6644af17be4e54dee8199309c17900f4ffa811bf0cd156f55d. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/ES09S1700221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3823e8259a66d8094e2aa4d3764944ad5560a6183bf7627a19178b95c8a33e5. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES09S1700222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x672ad9fad9e8dfc2a024ac8fbd96c8b1e6cf5061203121b3511347c95a8001d4. 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/ES09S1700223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7ae12a32cbe088c46b8f836f8906d303a2a3051229c8d83d46ca83aaf0df033. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ES09S1700224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155c594faea2f705012254e126d77f3a04bee8033b01d6b7cbb6054db44a5f75. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/ES09S1700225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8301dbdb2c1752f031f48522af76f3db0041ece2a655a8fa19511ce16e73c6a5. 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/ES09S1700226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea43be6381d6359fc8d362e1c06899b393cae9038091f70338ea14a4e5cc58ea. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QM6N21888210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d703fcbb35ec043eb88f157b854d6d58ad0209c74f0854c64e146fed0f8d3e. 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/QM6N21888211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1b20d71687a95c0be2658014d45339a780ab9eab7c02838b51e31fa511d63d. 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/ES09S1700218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897598f525d67306e5f29783a0347393c288af539cbba4e315389ae6a72db163. 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/ES09S1700217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5635e2343771d4bb96d446e7466a728d35316d5c82d77948f5ae1f2b815e05e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ESA011413406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecccd558c9538b7892a1a6d3c45af28780ed6d75f419cc5da694e86ddb4cd619. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/ESA011413407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afc37cd9df67750053222402d66516dc507ac14d80a93fbd848c97d06feee4b. 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/ESA011413408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabef2e5741722dc0f3455d57146c0692b45c77c2a8f2b5462cac783e3ba1ebe8. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ESA011413409.