Hamdan Attamimi (January 17, 1946 – July 1, 2025), known as Hamdan ATT, was an Indonesian dangdut singer. He became widely known after releasing a song entitled Termiskin Di Dunia in 1980. Indonesian
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 0xe6bc701293b8e6d118ef02be31a22825f786611c186645843e72e631cc453481. 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/1e38f64a-2c10-4a38-9527-9a27d883b40f.json and https://artists.proofprofile.net/proofs/artist/1e38f64a-2c10-4a38-9527-9a27d883b40f.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 0x68925083178d5e040cfe4944e8c17b4122251d8453bf9d94041009e7dc5b14fb. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/IDA882026709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb48576a68f956fe46c37d73ef205e36d829f4cca3fc85823612d019ae981212. 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/IDA239242106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1987afe4ed4eddb2df7437bc890289cee81895664ed0e8fb8a8d70f4b8be752. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/FR10S1429119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f416f9e5ceed306c3cc313744c816469b0bd549e26ab49d546acd1b5e3890b8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR6V82460063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9401ee42d7520419ebaa8a149e474a27db57619461545a4769d1a692ea077fb7. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/FR10S2268623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c47ec6adaaed4f90cfa7bdd2e774db89dcb0929284c7b7aed95f6f28f32bc60. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/FR10S2268624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe2d3a71a69381c8a8930ef161fe96e541cb684e80b817bc1efb399d0a7d9c0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FR10S2268626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e78a7a4879b97543624b16be39a97b780dc94084259c86f3baa4a3b9e5a8580. Chain 2 (Bitcoin): anchored in block 957705 (2026-07-12T12:50:42Z), 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/FR10S2268628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a97f96c2df2037de5b6b00b30857950eb6f3b9acbf1342d40c6b71823c3dea. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/FR6V82475640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23aeae19c5053f0f5736a4073f8a1a0c31fcdfb0ad85f6eae2d8ac4d73722295. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FR6V82475641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ec13527fb49100911fdfde9d950ff4486b9d537f6af2a5f25ff453c71c40ce. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/FR6V82475648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a16525b14ee408fd58d5e23e8361510caa828e2245b67326f28a4dc7affc5d3. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FR6V82475649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd82ea13e193500aeb4d69aeacfd7144d8d263276519a48d7b561024542ded4. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/FR6V82539668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4744d975791c11e8e3bbdb1928d32f490eb6d3ba95390e613a20aaf887cb167d. 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/FR6V82539671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dfa842ee37555e02f8709699654e24dc6b8d5b116d0687a070993caf81a2cf. 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/FR6V82539675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585368aa935d0d0f5b9815e33de31e02093cb4956c7fb5b212d07bfe4e5dd965. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FR6V82539678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf72707bc43412a36a1bba38417053e8447c9b065a0cb4547c80b909b7a740ed. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/FR6V82539657.