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 0x7803a55cd5ec681c579e5e67871d0fee5a0ee11dfe89eba568b0853ff0d183e0. 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/5ac18e2e-6078-43e8-ac68-3a7d4e5626a2.json and https://artists.proofprofile.net/proofs/artist/5ac18e2e-6078-43e8-ac68-3a7d4e5626a2.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 0xab8a5dbe945badc618a405170714c0da45214c061d39366d063de6d0b60889f9. 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/CZA168300627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8e81230f2159586234f4a7f630866870a6dd04a8c74c75bbb6c7b6eec4a178. 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/CZA168500715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0d611dd18b916dfc75b63bc09b6a0c23f12538247210e3c893a8af205a622e. 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/CZA169400332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70895753f765b5e7f8561398cb89e768bc63efa5d5df375afb1e1dc52599c8bc. 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/CZA210500694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7bffe8b3618b8cd68372161bfe3cd89521f3e0ac57b9e4b4bd5153a0f91f05. 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/CZA168500711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e254a06928f1bba71f1873ee6a674be64e2c30f325ce05105e77655587f6aae. 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/CZA161204891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3eb49b83184043c4eff4e603a3a6587974b8a62811bbec39e7c15415c6ebf2b. 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/CZA167800450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dd5c27492ab6fdb5afee125937a3946fb3a1a96c655dd3a0f05d74049dae3f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CZA167200560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c905812b3ba55f9ee5a16978ab2d7173d4cb9d714a10637f61bb569b16a8ce. 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/CZA168300628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58134c5fae5297a8535cb93194304d7882eff51b627fb6f9195ff41ee477f207. 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/CZA167800455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a186d4eb25faa06d876ef657f3a0b031f09831cd37c8311897a0843b8fff3f1. 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/CZA168500717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc2bc14bb4b1cdd1b70ea8eab4944f593bd947fe78b97119997a9ab649d16fb. 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/CZA167100456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3337aa43448140ab925562fe7de49e3538802d38daa36bd028c16c8c62091e2c. 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/CZA168500903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa338d2de92b001bf01c6722ea42ff95a7ee8d2a856c3c729cf0cb6c902c685. 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/CZA161003730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e74155ad586094fba49fbbfc189558ff8a4ec30d78d3f4dba0df0be0738a17. 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/CZA169200160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7384a21e140f159d1f530d5cba26d9517d4ab7fe8791e9e09147eb62c01bfb25. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CZA169200161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4564673d4c32b84654025b11019f65df70df1eb18bf19da4bc8fb2e8c07888. 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/CZA167800453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d0bdefb60ee48e1f9b23cbbf15ca61dfa84328f5f721b81d46cf08f635914a. 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/CZA168600676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8959dbacec4343b5728647e26cc02337d61d8e76b52dc67a70f46cd646ab3e4e. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/CZA169200156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe79ee54b1c71e28a04450c393e58c96ed642d95d7116cdd85cb2e84e7ba64e0. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/CZA169200157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5505114c2353b75f20e8c03ec10d263d46284cc0e4a7ffdf7f273fde4801be94. 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/CZA161402257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101fca72c093b7c2084a4abe6a475299f13ba6627eb3786c5e9055a6311f8772. 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/CZA168700680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8481fed5b2bf1b4740fbb00a92041787f988c0ff93cea9db99098d1b5c88517. 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/CZA167800457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9815433f84b92a157d5a2ab120e5ad5f97d60b913fe72e9cdc5afec66ce10cb. 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/CZA210500700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00219ced6dde212d8bab2795aa21044146cd53e5ed6ad0ec2d1badc1feac1cb4. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CZA239400175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcccdcfc9ff742f170c935dc458947c1ce70455108471a849cd8266d78d650a58. 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/CZA169000547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ef6afad705e99ac5d405a63b082d5cfaada19517df4664b9bce59ca3b1b77c. 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/CZA169400336.