Dack or variation, may refer to: People Surname Bradley Dack (born 1993), English footballer Craig Dack, Australian motorcycle champion Gail Monroe Dack (1901–1976), U.S. bacteriologist Harry Dac
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe94dbedbfd11702aada9099617583f7b5773c0fa969248c16f0527111f5e090. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8de1478c-40c5-4753-8a8c-a03f2535c604.json and https://artists.proofprofile.net/proofs/artist/8de1478c-40c5-4753-8a8c-a03f2535c604.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b727265446456a94614f3cd957e649b08960a4233e2ff6536ea5e0b1f3a665. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PLF241704562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd401f467ae8d06969dfd1ece893ad25a63918ff2e72f4db0cc48027708655052. 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/PLF241704564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x311113b8351d6c1918b8178c530a2484c2f287744af26d9bd4e63a7c6dac2630. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/PLF241704566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326e41d5e2fff89ee13fcb7f690d5cbdb0306b42397122373f5842ef20789203. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLF241704570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38cfa146ffb3bab52102d936eaeebb38bae5aeb2776cfccc45b2487171b3b99b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/PLF241704571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392a6760f586a94ee75f7a2163073fa0fdf764b4ba3b5d4bee29d3b10f1f91a4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PLF241704579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782ba49a1b84fad72ed003c5da38b345566f1989c88b96a76f493e6258a4ad78. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/PLF241704563.
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 0x4a7c41a2b27f4e92c73961f1130a9c9be016671fbf87e86eedf1fa3582e3c384. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/PLF241704565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafc40d9306ab401b426d24a6f222317d8a396222e78e08842e27ec1f8b19969. 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/PLF241704567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b73559d74dc37fefaadcfa455be2e6ea395aac01f2b8af315472ebbb4635901. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/PLF241704568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b8e76a5c0197c693bb1ec1cfb01d11e33d1921a7c6ef13ab6d56cce4a046da. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/PLF241704569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb418f8be85980f9818ca32b5bbe1a4661e4968b69ff26a59029a0d32744ccaa6. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/PLF241704572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13cc5042e031c241b8177e90c58dc0d1dd7b1501fdc88cf8e4afdf99582570b0. 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/PLF241704573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696c1388075351438d44c8ffa58115985914c4a54d708e18c635cb82a99e5883. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLF241704574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2ec36f81010f3e7358278d4e89c5a249f1b23ae22da6f99e83ff7e90c9582d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/PLF241704575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1d4ac3c0daa8409cac996386c04d6c69f980f2290143d81a48ac008da04892. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/PLF241704576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14fa7c8c249c68e641897bc65403fcf2856bff7814c35948d5a59ad2f11116f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLF241704577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac577bd11a76a039e2cfe2e4044b8dfdc83e3b17288ec6d189069012eb0457fc. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/PLF241704578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230034ddc4b4ce2598a1bef69ce8e2dd9a5f93ab590834fec3c86c33b77dc848. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/PLF242006819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839460e58b2c9a28eebe1b17a5de60d3ed62f6fbefb7d2451c2225ea092d7e4a. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/PLF242108631.