Combo may refer to: Technology Combo television unit, a television with either a VCR or a DVD player built into a single unit Combo drive, a type of optical drive that can read CDs and DVDs A guitar
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 0x8b68a65fbd0d680c4d4c637def484f4ca3593bc63d434362a5e8263c348ecdf2. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8928ad3d-7a88-4cdc-a165-c6d38c8569da.json and https://artists.proofprofile.net/proofs/artist/8928ad3d-7a88-4cdc-a165-c6d38c8569da.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 0xf68ff10fbb8ff054c0205aa37211be92bddcc0ecf10ef570d9b82f2d7f52434e. 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/QZK6P2541563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613949b5fd4a4ba0a5d9aaf14d4384afb935020644608cb102abac93944a34b7. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZK6P2541564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969effc087d46fa1de45a91815d85e5b9b354d597e1ae7d471867ffab11ae8be. 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/QZK6P2541565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d14f4c89b0b766421f135746ce1f03755cefc05471650b2da6f8581f8bd7312. 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/QZK6P2541566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e4ca125123ea7c14c76b3bda4546d168b52f70018fc2fd3f57cfcc9696f1b9. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZK6P2541567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9e6a0060b9b8820930d5ae97ab842a0c0eca43be69906ec5e63d085a048c49. 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/QZK6P2541568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b214426b3591b282fc3dd0849693e9f809cd4b9f507fe68e1b71815d0ba86b. 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/QZK6P2541569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1fabaeb1fd0d8ce1e811f8a32500452c50343e6937b8f6fa300a0a862ea9be6. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZK6P2541570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729f9cbc055291040a2f103889db41d90ebbf273ffb05825fbe9330e38db28e5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZK6P2541571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635b50202a9a2c0fe632cb6cf5b5e0ae1cb4b38d910cb6da0369d499c7c3c4c9. 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/QZK6P2541572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4816f3842bf2d7083a09d73ed3d7cbe833be9b6c7ed8760eb3142c87940eb9. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZK6P2541573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81324da2cd9019da6a25c2bc9b0e330a8f4c2736f42834e70bb6691ee1af8fc. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZK6P2541574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812bc77f61313bf0ad6b99ddcea479b07d378c00b9f1cad91598026191aa188f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZK6P2541575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995d3ebeb24bf6431b45cee479b67492c2a5176c40cb7ccec1abd77f170c4009. 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/QZK6P2541576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b60eab1cd5e6c5e5d1fbff41fab45a07d99530cbce146434f1352e542072bf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6P2541577.
The Happiest Days of Our Lives / Another Brick In The Wall, Pt2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485108565430c62f30bc28a8a226ebe02ba677fc1e85ae409a7ce1c24b83b9c9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6P2541578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1262bc5524ea58c427d91ab2a641e8524ea130d5ce6ab51fb30548317cb6ad. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6P2541579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32148c78da09e85c3e999c964c6b720498cfbd0377519096622882443b5df703. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZK6P2541580.
Bohemian Rhapsody / Radio Ga Ga (Live at Wembley Stadium, 13th July 1985)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeebd96388f8ae0135999bacc77db8767717a8eb51408388b5ab30c15addc2bd7. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZK6P2541581.