Sigrid is a Scandinavian given name for women from Old Norse Sigríðr, composed of the elements sigr "victory" and fríðr "beautiful".Svenska namn - Allt för föräldrar Common short forms include Siri,
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 0x528314177c4293131ec21d96260df6ee22a42b7e493599f90a327aa4469cdf90. 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/b8a70464-278c-4202-88ce-48b9a80c80da.json and https://artists.proofprofile.net/proofs/artist/b8a70464-278c-4202-88ce-48b9a80c80da.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Head On Fire (feat. Sigrid, King Princess and MØ)
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 0x4d96dbdf72baa98bcce39b6624232e9b9d8734899b9a6937d97b4f65f72c5b99. 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/GBAHT2200481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef102fd0231418678fc076873a9f9bd9f3ccea7fcac5bcc32c02b15077f7435a. 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/GBAHT2200456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4396d362b37198089e0f6dd42c126a498d2a036e3f6e0f4359ebf15b798e85. 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/GBAHT2200169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99df131a4791a9306f02b747c9dc08e8f0f74531a483fc7c3069bf5eba7a5f0e. 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/GBAHT2102125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1953efc6558126c5cdbc69f95b3c00706c0ce5cd9823f4ced9320e22802c028b. 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/GBUM72105768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3856b3cc433229b0446d993e2884308cabe6be7d2c35df863aa0099941dd816e. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/GBUM72103556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9e6bb0fb0b47c4a9aaccee5bba949f30aba6000aaaad090a928dae11746ac1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBUM72204096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f9b565c5d24134867b5a4ac5d6f573360ed40b4021e071e173bbf119fd0c6b6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBUM72203254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef102fd0231418678fc076873a9f9bd9f3ccea7fcac5bcc32c02b15077f7435a. 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/GBAHT2200456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4396d362b37198089e0f6dd42c126a498d2a036e3f6e0f4359ebf15b798e85. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAHT2200169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99df131a4791a9306f02b747c9dc08e8f0f74531a483fc7c3069bf5eba7a5f0e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAHT2102125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4396d362b37198089e0f6dd42c126a498d2a036e3f6e0f4359ebf15b798e85. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBAHT2200169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99df131a4791a9306f02b747c9dc08e8f0f74531a483fc7c3069bf5eba7a5f0e. 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/GBAHT2102125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99df131a4791a9306f02b747c9dc08e8f0f74531a483fc7c3069bf5eba7a5f0e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBAHT2102125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78e08c982887f1780da35c7e29516e1691f99bf3a57ad6b0fda9fd132f2d29e. 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/GBUM72103353.