Mattel, Inc. ( ) is an American multinational toy manufacturing and entertainment company headquartered in El Segundo, California. Founded in Los Angeles by Harold Matson and Ruth and Elliot Handler i
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 0xe63a49c93242440b72991c4607ac30e5b33e2170d02a18f50907a9f628d06194. 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/86c963bf-dd4b-4189-a301-be43ee4edba8.json and https://artists.proofprofile.net/proofs/artist/86c963bf-dd4b-4189-a301-be43ee4edba8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Monster High: Soundtrack To The Animated Series Season 2
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 0x0b94a33cf129f05bae970419270193e2b5a7cb146a3b2996f1232bf8f3f44ce7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USRH12401831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc72fa80eb89b5337dc0c947451d317bd0ca2a04a8b325e577e572cd58244a33. 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/USRH12401832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa217619e4dc2c97ae23a17a3d2a2a306e8c262be103c7a5d3247e1bce4b92a9d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USRH12401833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e8b8aae8bfb2b32d9f9c6b262d81d3b6f4e8d8e7375ac2fd48d82b9bebda67. 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/USRH12401834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa175d656ec87865eee5e6c4bf0cdadc57a19b27b6e4fca11e474a6221eda41a7. 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/USRH12401835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347c24b2994f2e3da7dac5289ac1e4a00e770ec65a6fb457ea52da93af7ddd4b. 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/USRH12401836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f020a645345bb2bcf010ab270f2b1e856f2c020512b9275e266c56ac3a42080. 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/USRH12401837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd986d62950a50a4ffa8a5ccc102bc6e6965f7b55a6c454f4b38b495ed9265323. 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/USRH12401841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5078f28b481325a4eb0b5bf5d0e4b96783ae453571d169d13e67ee97eed35ed2. 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/USRH12401842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12934f44d5ff1a01c823a4cbf109386b77e09b63b9dc85de5264ca15db361bd9. 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/USRH12401843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34fe482d18b4de54e6f77198f146effda591ffd0fff8675f6029952210a51276. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/USRH12400243.
Light It Up - From Monster High: Scaradise Island
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d673e65bdc6b8737230de6b8da7ded61015c05406a599b1373c16d6bba6869a. 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/USRH12401012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bef922a4dd64d89c077de3e2d21c90c6667480a53f79462606e00b99987cbc. 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/USRH12401645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7325460558e117c3cfb4eccb62be862f3bb63f76edda801a7a7bd38c7dcea9. 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/USN1R2317002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdf0d9beea31ea3adc885d21566dd9bf06d2d8f6a261503291efc7697e3327d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USN1R2317001.
We're the Monstars (Dance the Fright Away)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b5a8b110dbaa6f414f51baf43ce0848299cdc62d733de32c49aa6ad34029e0. 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/USZ5H1619030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3d39979e01c1fb578b12e88a05c5724f4b5622cfa7d65cac706ad1a8314223. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USZ5H1619031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbb932f038b5e5da18242dcd4545319f76fd7def318c62839af399fad60ab10. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USZ5H1619032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14698492ceaab4328c0e1f648e02e88506e812e94f6f9476975607104b273ff3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USZ5H1619005.