Mark Masri (born 23 August 1973) is a Canadian singer, songwriter and producer. He is signed to the EMI record label and has released five albums: Mark Masri, La Voce, Christmas Is..., A Christmas Tim
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 0xf6b18ae3032e44be247dffe3e73d1def402f55d4cf70b1d9a34eaf6f65987d01. 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/eadcbb16-cb8f-494e-ab07-16621ebafc08.json and https://artists.proofprofile.net/proofs/artist/eadcbb16-cb8f-494e-ab07-16621ebafc08.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 0x3221a3086bb233033b5623998244f7103ba7a0b5c4c35c69f213e4883f6ef0a1. 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/USB4U0900274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233c797fc762d165a4e7c74901e7775263461deb431ebb68fc8bce7c34f5507a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/CA1MF0921427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ac20e5b711465384e67e64ff348ecda52c9d091394b79aa127fd92b0c6ea98. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CA1MF0921434.
The Shadow of Your Smile - From “Castelli di sabbia”
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5b33c9602e7db9d4fdcccc6e365871873d1ffeb752c3667bc3b1737d0126cc. 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/CA1MF1121436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2420661dfa46bfec025ea69e8ec4d9981f975f3287b6c2e4122e4d8586101f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CA1MF1121438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb843b02d7b9724a01d609923c00a09dab21e49958f001326f1fb1c9da034ae2. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CA1MF1121437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f1b9d1531e4bf96942790750529691becb6fe6324b09744c239e30576c5532. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CA1MF1121447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a4a9e1b397eb2a45bfc948f0f96e061ce0f140c3e9eb629e25796378b41e3e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CA1MF1121440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59e5b308aa2c7199f3b5c9d0f2549cb87ca770224e8a5b4623bbdf1cb773eca. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/CA1MF1121441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b70103a3faf4157eb24860a85433505b520a4eaf59ca68dc1bc72bde090f38. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/CA1MF1121446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6d830ebb3337861b107429fc02f200f55e3653835a3a6981cb8a54df03e670b. 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/CA1MF1121442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce2b7e06ec075ea5bf77e0e08e33f974e8ab1b7df8f38980d0b288afaf48f3b. 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/CA1MF1121444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074c8f418cbff8dac710fbe10f66b9d7bfd13316ed9fce1716e8985e653d79a2. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/CA1MF1121443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03957a3aeac80bcb783269c9d2c584d39439c7e90f7e545eb2f8e399217408a9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CA1MF1121445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5035ff96a93d67d90846a2133f18fa32e194cf39d2be5da1ea9acf25141522d. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CA1MF1121439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42385f1d0dd11a1c1e1bcc3c83c04104cedd8d65d0baf3390c47fba807691d69. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/CA1MF1121448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942bba8139849dd2d4c7676e562eb6be2df69dfce9ea4d9ea9ff891b71671753. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/CA1MF1621471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5266d2b2c815c2d1a4eed8d54c3cd6690388d87178fb78e72fc4c61fcce35b. 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/CA1MF1621475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8a8fc2d676cd65cb6ff4706a3765776a926324e1a0351c0c45c16e911c9c9d. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/CA1MF1621479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c397aebed4ecd7a1b7823ae47a46fbb6db6285eca98b497c2293fe9e346219. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/CA1MF1621481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0c00e08a1f6abd5869d737cdc0373fa253778443b57929c03e0ed463ac3455. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/CA1MF1621483.