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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 0x050390c0e893f8834328e3ae156210c55ebc0b4def733e7aa80c8274255fb1e2. 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/174f96f9-c872-4e58-81c0-ec6079f20206.json and https://artists.proofprofile.net/proofs/artist/174f96f9-c872-4e58-81c0-ec6079f20206.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 0xfc520fa9a46136fd2ea74433d974e8e80887dba159db9db4479afd9924be16dd. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZDA62263836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c6337e5bfcd5559a77830362d32be08fbea0bb9cb79e4af9a57d6e071a27f7. 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/QZDA62263839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c883005b053d29e45fb4a549e0bf7b67554fee16574c3ace556ef7ed3ea60b7. 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/QZNWZ2108809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8eb4525732a4cf48b058b81ce69b3fe344c2e846ee39edc00004b4b8e7f9b7a. 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/QM6N22494548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115fe9e36ab2febc20d8cc60ebacf9e16c5b9ee7ed6bbfaebe6b0fbdb732a9bb. 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/QM6N22494547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb674bb82e31a45809f7129096824f087437ad076b3d94d249a8931db0e585c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM6N22494552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ced9da750af6c3ad0264ee235b196b76456535185a0b3f0aecb54ed695a7da. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM4TX2400428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4125c03b2dd3a3186bb7c43467469e31aed6a3c366e65619b0f550d264580ab. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM6N22494553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54f23019bf4a068ec58d68542eb1eb1d2eaf5ae6dcceb8759068ff79785dc6c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM6N22494554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c76e6edd2b8adfc5b8b841f706b47e67b2694f7eb60a59bfdd448659e8c257. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM6N22494556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4165941ac3079ed0dc6545907f218b80e6d6abee1e062f6110cd5730e669be87. 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/QM6N22494557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x035bf126bb3ded70bab209c63d16992a2f4005df47d7de4eaf87e3e1a106da5c. 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/QM6N22494584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451826eb55a70c888770c5a594eea185f24b779d936e5b8f8273525e1386ca43. 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/QM6N22494559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2147b8f41621b31801e1e6126706ef8e8e863bdd79fe9872719bba3a83490d48. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM6MZ2439914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9e82b9663b5abf60ad48665fd7c8af0b2b0d77f1d1769124ff3e24b547aa0a. 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/QM6N22494561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ad41da44237dcc3e9c7e7e63d2c3b8541a414cb164d98a3d3b5067e051e98c. 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/QM6N22494567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec53bc58701fc0f3fcda7624af5d6507cfd4de7b31f02b704d7003dfde91b73. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DGA082467024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aab992ce25f272fc29ab1a886995642e3b9592b61247269cbc3fdb55f592b70. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QM6N22468363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2147b8f41621b31801e1e6126706ef8e8e863bdd79fe9872719bba3a83490d48. 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/QM6MZ2439914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ced9da750af6c3ad0264ee235b196b76456535185a0b3f0aecb54ed695a7da. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM4TX2400428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912af7407c5aa612f5e63a374a5f611f71bb7c2a543771ed14a64877c6fb276c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZK6Q2151555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57003b552a840d62633832617f08eedf8da28a28f02e23e2c8b330f669c52e69. 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/QM6P42446079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22bab1030ea11d2b91e6f90891214161ee64d2578bd1b44aeadb6079a6b9b4b. 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/QM7282461202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158038b0147c378c831a7e15d42df5906fbe6be2e89d10cfe9686bdb96bfa172. 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/QM7282461204.