thumb|right|S VHS Recorder, Camcorder & Cassette VHS (Video Home System)ETHW (2006). IEEE History Center: Development of VHS. Page cites the original name as "Video Home System", from the original so
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 0x9cc542fad05523cc685a1cc7f7489a51e0bae43948096612ae65083224a918f4. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/170fb9d2-46e2-4ca6-a110-833d7efd8a56.json and https://artists.proofprofile.net/proofs/artist/170fb9d2-46e2-4ca6-a110-833d7efd8a56.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 0x5358b1961a6aa07dce67bf0d80f9e9aa48dd2f0637eb8e6ad5351d879105e6ae. 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/QZMER2093714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4a35e877c26e720b5659153e855ab3e5e46d6962ea2978ae881389cee520f7. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZMER2093716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31c9073a9ec754f0ad471c8c71a97e6cb7b85950d70390313dbea4bed4258c5. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/QZMER2093713.
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 0x94b83d798971c3d4a5a66e616abb4631f15f067956f6dcc8b5e713c94f1d1afa. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZMER2093715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91146344506c6ae1652cfd5219488965b3cba61e381c65ea191550d3d8591e9a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZMER2093717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88cf39733683d0900d65c749c5dde20fcc1b9477f4722195b5aab02e6881208. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZMER2093719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fef24f6821e3f968daee49201e7ddaf00e9ffd71367cd9e3915160d4a125f85. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZMER2093721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f40f1519a25aa28a176ea18830fee5e1b51b3066c0bb3078b44b16f7356f121. 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/QZMEM2164899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b3bf5cd54796bdd4923030b23bb16c545f2ce7b8629a8f6988b2bfcc98e730. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZMEM2164901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4494946c5c06d8ba9c9f53eb1f1171366bdb9c1ed4d182702368e61b85b71cc8. 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/QZMEM2164903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cad713e117cf7acf7449be3f4ca610b8868f8e1184fa5d6c2db386ccf56c101. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZMEM2164900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cc8bf6cda2c58cf7b802e15bdae1b12ef89d4413f9dc29e29310b18872beac. 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/QZPLR2101916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976adfe630df31471de8943963c1ab3bba9629bb1ac61086dd79f64b7358a58c. 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/QZPLR2101917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b8e3420754e9d02aba9c710dfc569a060a36957f7d01db34d1eb613bc33c66. 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/QZPLR2101919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09e282b3faec86b1d7226bf47f796fc5a713c1445259a8a434010467fb5eb86. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZPLR2101920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962324456f5a3be161ba488e9667dd7e4236f9993c7e7215ccb300a537ebbc1c. 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/QZNWY2368391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2beada83cacd24618ebeac7a97af5b0461998b6d5ea4b7c8161d260036cc1ba4. 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/QZNWY2368395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6c4e5c14f9601ec708bf724566e6af12d0c27d0dcf019aba947da4dd04e3c3. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZNWY2368393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b099298dbbe58da0b1b3a1a1a4dbeb8efd3749e670dce7dc47f9e21732e931. 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/QZNWY2368394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1529a5c362efb8273f417c660ff0d2edde685f25cad0245bc9ac6e4b5d9456b4. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZK6Q2592263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb87dcfb8b7bea34bd8ed558c13a2b5356809f130832bb522504672b805b556. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6Q2592264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0342f4507102faf57ecdd445102309f29a231f874b6d72b68a4e790d1357ab62. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6Q2592266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723da3bedc85e172ee236c28895005e9018a9646fbfb819f836fc2deace72a15. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZK6Q2592262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170daa4e0d4f7a2d1b65014e6a82512f3c1b8b00166446edfce4129e0677b692. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZK6Q2592265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8806a3b90b97436a39fe3d40a6e70a6c8b536c656b374b182f5791711dd4d6df. 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/QZWFL2551361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0f8ba11a118bd7939598e4200e90a06c50f8cce92d8cd29be2080aa69f172a. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:27:42Z), 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/QZWFL2551362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef6dd5f6fea767359c6b4ca7126023c9f723d2d872654aebbd99105a0d98d193. 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/QZWFL2551363.