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 0x479248ef32ee37cad271b93a8358b2f6cd0218b29ab40ff3031319852932c031. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8976591-0b48-48ce-8110-217bc7472441.json and https://artists.proofprofile.net/proofs/artist/a8976591-0b48-48ce-8110-217bc7472441.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 0x2277ed671008e928f9761f7f097e45c706e66e199011a175781af2bf1a56bf3c. 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/DEXW62300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932b1f6ecebb81378c60b1227d3eb663498aad596ca4cd0f3c0224944676901a. 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/DEXW62300093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3838576c00f71199cdc6c2fdc3ff59c385b69242151e0612522626f969a8c57. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEXW62300078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232ea734b8e4f634cefc72bcd5118068ea3210ddb401109795f15c88dec1aa8e. 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/NLT2H2200975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a209707c53e7bebad5488c7bf42ccacc8ee41c83788741c1309374964ef12a0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QMFME2023870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c598e6676785d28f9751621e2bdb292397e2063805ca72c027b268c431981dd. 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/NLZ542100474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e0afee12c80c23d3f2cdf37c30c7110236ff3a5ad62ca9ef723ed2dfdca695. 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/NLC242100822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de662e083c2208c848ab91455190e775bacb50190afe2761a2273035bc52546. 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/NLC242100745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe191d754115164ccb406ebebf457ebcdf6a8d0894d8b8f06e7385131a3ca8c30. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLC242100724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8349aa8a52896de8e3169add06a3dc00b40f77e41849d1b68c921b2a3591f2ad. 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/NLT2H2300841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d1a20df12504cdf31f43ff4fab5fac137b89af45a7f4e448bcf22c21287393. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEXW62300165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a27f603d811c97a3b62c0484e479a7fc1ad4db1e76ef549a74dfc1b2675e9b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLC242100338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf91d9dead99303650119f5322c3c534d161ed652360aca322265d9b257ac470. 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/GB2LD2310068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb102bd8379af11eca6c2073a390acbcf5e3b376c6c5ed98a39534dfa97bd49e. 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/NLT2H2200600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0553bc89b46b09358c95bfb8378801ef6af2f5527db811009da6be4b387b32. 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/NLT2H2200507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa87711c049dfa35b74a3b3a2e3d9c973b72fefd0dbd5e04dc3590fcd43fb0693. 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/NLC242100118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf777d5e0dc393c65374e7631a09f377aeece23c58e8fa20a1cbccaa4a83f13bd. 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/NLC242100063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf777d5e0dc393c65374e7631a09f377aeece23c58e8fa20a1cbccaa4a83f13bd. 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/NLC242100063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f50af1987cb40640dbb6e008f99f8e5d0c6ad571c92adb95c0f9b7732d9c2fd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLT2H2100554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6a2fda15e1d80385333b822813dfce2a8f9c58399ba5a5a29483733eb8a6ed. 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/NLT2H2100492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f91bff1b61339601b0a9145274bf142175ce108615c6987d4822af2fb5ef01. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/NLT2H2100443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3b2808e1c44880c20ebd7c654e9ecb62bf80ab5fe8cb903d161999ba88daa8. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DEXW62100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24ce033cb44085253be3ee869db6a30081d204b9fa3cfa45dde8985c26413fb. 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/DEXW62100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb845fe10fdd963420d030a5e0afdb8344fe4956ee94253875b0a175a25a2153a. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QMFME2084272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24aaacf6558abce33dd39836880c573b01107599f184a919d06d827a7326de08. 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/NLC242000053.