Oscar Stembridge (born 29 December 2007) is a Swedish singer-songwriter, multi-instrumentalist, and actor. Life and career Oscar Stembridge is a self-taught Swedish singer and multi-instrumentalist.
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 0x08301d9cb2ee3643c6532bc025a4152473f268f92ade2e79b09044e183730131. 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/1bf6a759-d803-4526-bd5c-b856c3bde944.json and https://artists.proofprofile.net/proofs/artist/1bf6a759-d803-4526-bd5c-b856c3bde944.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 0x65d12055816efdac93c18e50f95b17db660128645ff5806f63c9478a0e5aa5ab. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZDA81842659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2936bca896523f4721cf25126938ea8d2e59a8026aa6d359889ef2216a104cfb. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZES51824837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64305fd4344bfce263ff7972312376d3c2b348979f61ea7c121064530d1ed064. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T08:17:14Z), 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/SEUM71900198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26cb8fef3c2f75bcc1bd52bc25e10daa53555b75dbd7ce7ffa6497ea6a7c63c3. 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/SEUM71900497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62c8a16ad174ccbd36d2040d122c497681c6275bb0a8f71abcab515b942d8dc. 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/SEUM71900745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626ae0eb98dc8b3f424ebeb834dd57d03cb8862e0cf1a7c5b6c250971d6b5a25. 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/SEUM71901106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa35f107557836027293a613b81dd6be2220c8592add0ba7cbe5908d8e6aadb. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/SEUM72000100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca9015eda0149c6e1e4f0b430f5204fedfad9db1a41b4c3e99964fcd4033884. 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/SEUM72000574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf06c0cf730d3fc2120f364096ee5901d8fae626d03a206e32812f0756edb16a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/SEUM72001228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ecb809fed33669d863ac704268893a7a84ed33c81d0c07d17659427d87f2a3b. 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/SEUM72100452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970862fba9c51c346aeeaf9459bf6a0462dd39e62391d0a8a52a16e3a04d0e3a. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/SE59D2162201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe13ecb687a17e6a69e9e62faa1b461eb5a6bb44e7820659023e5dcc4ac3d81. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/SE59D2209201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01eaf14b20ddea18c1b0b7ddbdb0da14595677770b2481e51ff4ce11eb836d0f. 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/SE59D2214801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892a75ad36c65e291626d76876736bdf33afa3e04dc975d5df1ee784e40298f6. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/SE59D2220601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29c8eebf6850ba9ddc5fd7371d7ac5a56d1393e89108913d82f7f353c1b314a. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/US38Y2431947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87403feb556db6133e68b50d1641eb4314e28beb407242c1375b71cb999e4e7. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/US38Y2434694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f94760fe500d388ae73216b3be7f44835e1b4af5a99ba4bf513da3bbcc0f10. 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/QZES92057721.