thumb|right|260px|Viktoria Tolstoy in Aarhus, Denmark 2014 Louise Viktoria Tolstoy (born 29 July 1974) is a Swedish jazz singer of Russian ancestry. She is the great-great-granddaughter of Russian wr
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 0xde23fc8d7062a8deb697228885aa63fa1e6748eee15f3b6fd6a26f76a5200516. 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/2124e1e5-43f2-4a66-ab07-724037805e9a.json and https://artists.proofprofile.net/proofs/artist/2124e1e5-43f2-4a66-ab07-724037805e9a.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 0x0c1c5dc9e5e7b636f9acd0d9ade47a3204d01b7c40b4d6bb73e503d0f686906e. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/SEAMA9573020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7020e5f8bcfa3b61c809619bd192280797b734ef6d0ccf611921a9fb90f1433c. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DEA890400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x036ee5abf9b3ae1027c32b1d5a1a6107d36544a2c20be472c3003bb12ed0d3e0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEA890400038.
Pictures of Me (feat. Jacob Karlzon & Lars Danielsson)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9608ed9f02c1bda2d63233274a9944cce6d95548d70c8be12768f014abb1966d. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/DEA890602001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722263ef43d85d66603802871547a8893d15e2a9cf4a6bbc6a54f3c888f338f6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEA890602004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78fb8fbe2899100109deba840f749ac474c88ee7fac17b09f82f25a48f84872. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/DEA891301047.
Meet Me at the Movies (feat. Iiro Rantala)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7041ed00200b1848bb174c36a68557f9ce5c88dea3c660432e762bdf98cce3e0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEA891700020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e175fcd5ea87360b1fb15ed7d028cfeed66acf8d6912baa1d75a9e173de5215. 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/DEA891700021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47854fe86e1f044f567945b3d32a29ea78120c52ee0d25fafac2ada7ab5261a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEA891700022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe540d15afade78dd46b5be50005aed186841c04fae7b18686a579063d7eaf2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEA891700023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156231e671063dbe0962371d5dbf9a3bb31a880223c79152338c12a177aa9dac. 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/DEA891700024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa88294fa211518a4352e2a7100fb705dd22fdf5368e32dbbfe9f4ab032a0ddb. 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/DEA891700025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75aeaeda3d23261969e4c78234edf223f6c8ae7eb4a1380c7c3220ff68a7e2e3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEA891700027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb5e65798bd80d4335cf704f31f3c88ec26e84e1330d83760cede7cec97ba66. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DEA891700028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719f2e24bcf5861bbff21781fc8bf5f4af77192fc8114bb4a04ab4ac3a5f147d. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/DEA891700029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf32b06c7fb073af95d7c31e2441d1fa2c9f32ad5179a767a79c03731ba1a58. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEA891700026.
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 0x1d658d8dbcc3acb85345bd8d3b7c0f80a2b7ffde0710e76c9015df5b8b082969. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEA891700030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ab12e3b295fafdf28cffd921c3733a764beb45f380f414c75fe81627d325e6. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/DEA892000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1a25ae033cb0921696dbb5927e5c56d6d7a94e978302f3bd85b269573460f0. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DEA892000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef880469c70eea8dbbb3b6bc8f8e9a221bc25d1d2f3ca8c1e19433f82ae080b3. 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/SEAMA9853080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7367756ede3c3eb95642331cd3c82710959344dd75ef84299cd958e9878e9fa. 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/DEA892200352.