D'ZRT was a Portuguese boy band consisting of Paulo Vintém, Angélico Vieira, Vítor Fonseca and Edmundo Vieira. The band was created when Portuguese television channel TVI cast a band for their series
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 0xcaba4051fb8d1d0414c38c7143f4c32b6d0f8eb4e523625d712de8fc53a7b291. 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/87c0f72d-0d93-40db-a1f4-24428e7c8f4f.json and https://artists.proofprofile.net/proofs/artist/87c0f72d-0d93-40db-a1f4-24428e7c8f4f.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 0x20e84b791844538439e0a1a7e35e2ccb0dfa9158a5fa0204d1cb06622f16a672. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/PTFA10500298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a11d5613f64e96c1bad49e66f4c2ae9f79436d7efa1be10645bd0aff57232b7. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/PTFA10500301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8927c1d5c13e82774ac139e9e49d8298bbfb0e45e3f8e9967abdb53ddaa1809. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/PTFA10500303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83875f85f1b8bd080c2a60b2961963e189b2c25e9f13f472f7936b97c1342142. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/PTFA10500304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29406dea4d42233199820473577f5fb15dfcdb5b1da0f4b1645119b9bddf8c3a. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QM4TW2230904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f75dccf5a54e0695a158aac51895ec0915eb38cb5ad92de5c64e8732e3b08ac. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM4TW2230905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124d8848d1a73a87abec0da5d1ca27f21fb8c003332f7a37a0dbc541ea54a688. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QM4TW2230909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c800e9184641ddc85cff6a5c79a7f82e58bdfd747cee0e0e2150812725d5f58. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QM4TW2230910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10b2d1b042e5f96f5f635efeba4a84f451e4dc55ba38f3c14e1263a923d1a06e. 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/QM4TW2230911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e02f549d6ccb897552ee63b0449668d4f93aede3d869ec2a96b918f6cdb06c7. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/PTFA10800715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9f1863cfe50d0b1b94e1aa11588a54c76abd572383a9fff6df2ba462d85fd3. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/PTFA10800718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c23a257bd2922dd7400276199e28889f502c5d9c4a24497dc6b0de3a471d6cc. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/PTFA10800719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13f22cd77efb15f70dbb203007219ec53b10420b2f032e7b2815fd013cfd573. 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/PTFA10901223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb537fe62da193c8f9d900e3e0d9006fbd2c1ec63dfcc5c9a8e0bac5e6ad93fc0. 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/PTFA10901225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d7f72e7bfb844ae124dd56da92264fe522f6a1cb6e00d6a4277e6f127923bc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/PTFA10901226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e51bf8d25194883aa60a0228224b19b953909ae10d646a0014bf140948a66b. 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/PTFA10901229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c21f897a10b7e3f588d4d4516eceb90616bf5191a4c3f0203ac47e94c0ec37. 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/QMFME2242758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83325b139a595de47a2509c6b18270974fe762d659e76059bfda780bddaa10f. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/QMFMF2201755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f41c81e7922eca260a676e06b824827dae63af40c77f8c1cc67cc2ecd64569. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QMFMF2229902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1518ae41748ab07daa41ca84a6514001ba7c4ab743825cc9bebdaff7ae5ba268. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QM4TW2347973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a8de2d35775fca354ce7d6c4a0702b7c01091e6d521c69669bd82c68549329. 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/QM4TX2309379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ab81ea35e255fd378c8b43d6c3d8d7f64a85284ae7890ba554d15829b6c558. 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/QM4TX2384183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cbb01b71178ae1f20d4de2d2f9d991b62550ed9617a1ab7150268887c3656b8. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QMBZ92346693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba648f461cf4394e3401d3c9ac80c09811c0b988337df83a34e31bf8d8e9d41. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/PTFA12400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06857f12bb8bbf15d3d2ad96ce1225f8412933125bda9464626bc225c1023871. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/PTFA12400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91428f6e90e9826675b41d61918268019b359a69fa90a55d871f927678bf81f. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/PTFA12400046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1768d6976ead40daa875344f710bbfc42a8432ae744c72db58d9482c1b147ab6. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/PTFA10800709.