Toska is an island in Alver Municipality in Vestland county, Norway. The island lies just west of the island of Radøy in the Hjeltefjorden, at the entrance to the Radfjorden. thumb|left|View of a l
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 0xadc78c3e9b9d973522b9180162d0b8a87c1e1792ab85256407a6500b9758cf37. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/622bafa2-548b-4d51-830f-72253957f890.json and https://artists.proofprofile.net/proofs/artist/622bafa2-548b-4d51-830f-72253957f890.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 0xc16954845798e6264ac07417e55c427bd326d6a18fe68a3e574a4b7b375ff52e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFYZ2278256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc37523cfedc1f661c2cf757b93eaa990f210453fb376b5e9d68439aabe731ac. 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/VNA092109034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21e1c94e81715dd8c81f12f56bc1614c21c6e4f8d74ca9f55d134b7765a215a. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZN882238175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813ddd0f6d1f886c319421f53581411e89ccaa43e0cd0e83ea8640a6a1d7b817. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZFYZ2561511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cf80d1bfb46485356f3c007ffce1f43b0b09688d554be2c080487387a13144. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES82599841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc546af3dceb3c4c596e3edc7dffbac1b60aa8a3f4b8dcb11be8c581a1f81f360. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZES82599842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813ddd0f6d1f886c319421f53581411e89ccaa43e0cd0e83ea8640a6a1d7b817. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZFYZ2561511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f926e5120dff8d0b447f27a6cc1e2a1cfa71125f8c7b596f66ec40ff80b2881. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZES82599843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12923fd65678be9b2ffc8dc9a80ca7338576ea5f1c8da96c08d12bbd731482a. 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/QZES82599845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7442a702e62f06fbf53211e01eaf6580c485daff4eaac64a7ae3c4cdab4f62b. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZES82599846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a4fe0fef6c26f5f5be3f992390707626bb468179df2ee2ff66261b6b47d3ab. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZES82599847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae960db883a040466dcc55598ac456f12b41eed2d3b8ae21235adec145d68a8b. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZES82599851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d30fc54db45bc9438960a45b5b7cf52daa98512ae2bee774fa63571959b9baa. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES72530865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3843689d47acc45469710219daf3d9eff46ec65daaa8ed5c2cf19f73c6582146. 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/QZES82599855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f251569c9ebd4e271a7e813f9c407c8012d772c9e15d76600732190e72b5cd. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/VNA092501740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7650312164a02b21aa6adb10d59c98b9a97d71c4308c4a8f080fcd9e637f9c0. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/US38Y2584898.