Martin Hederos is a founding member of Nymphet Noodlers and The Soundtrack of Our Lives. He is also a member of the duo Hederos & Hellberg together with Mattias Hellberg, as well as ex-Esbjörn Svensso
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc4b3e1f948fb340029f2e34394cca3ed80569beab2eefc29dd5bcf63e310af. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c302b4dd-3fd5-40c9-8fc0-729ca1c5b6b0.json and https://artists.proofprofile.net/proofs/artist/c302b4dd-3fd5-40c9-8fc0-729ca1c5b6b0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660c6a0efa94f685069f023ec87d0e67a77f4d4e1f1c1ff0b29e452880fb897f. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:37:31Z), 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/SEACA0600801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798917ab7458b3abc641ae34e38f1bd06a87ed59e64d156b1b90bb1b0514bc25. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:26:28Z), 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/SEACA0600805.
Piano Solos - Sally Wiola Sessions, Vol. I
Jana (Soundtrack from "Jag for ner till bror")
Händelser Vid Vatten (Blackwater) [Music from the TV Series]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8427dc7474b9932222ef9e9e170844e61ba2cae655e0c18b20e55fdb57c5094. 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/SEYOK2301891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6ffc1a09711b5bd8572b80d828b6f0ea2206d089e44971dadbed6f5216b8f5. 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/SEYOK2301892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd331a1ebc73d5cbab8fca371941cef6bf88ee11b9bb697e55d8358f9e6b8390d. 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/SEYOK2301898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9354c900b5ee5e3fcaaa4996741318c001555e2a932ac2eab16abf0df6532b9. 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/SEVGT1105701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db93d0fc0d3d0222cd1b7737e3dafc40d480e7a542935bde7a0d6e105d39655. 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/SEYOK2301895.
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 0x8b4b7bf3726bd8c5dc3e01d980cdfc177e76fb4a70619494bf7ecd0bf0583477. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/SEYOK2301896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0461fa1f53f5d9352c9b35f0ddd939ea8083b8b9f9d4812a80b3113fa1129ea. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/SEWDL6152870.