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 0x3286bcf89a820f286bb722ee041e9a45e1317a22d3f33bf8497548ee8edb4de0. 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/2fd6c5ab-60a0-4a41-8f5d-9d10785e5826.json and https://artists.proofprofile.net/proofs/artist/2fd6c5ab-60a0-4a41-8f5d-9d10785e5826.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 0xf91999d4e7d52c35b170491a22230e5d17e686059c5da21568e40fa2d502c4e5. 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/TCABU1465223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427d5e051837e8b1a3653e7f6f940c8688962c2da71d938f791e537a73c8a384. 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/TCABU1465269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a3bfc4541649969351e656edf8fc4f3111e2817f9ebde2e03fcb2e0fc34d12. 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/TCABU1465270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f655e8edc7c04701b3f418b4db87f3b7cf5ca24e2bf717dc4f718a34029488. 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/TCABU1465271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46103acb0f6e1b05c5bc345171d2e1e389a47d222cfa222e8afadc67b8792571. 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/TCABU1465272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895addb4bcb6d4aa2c3e3da1822649d295e82425e6a8c65a2b5e897ea570a9c2. 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/TCABU1465273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x421787cb8e3a88c83cad138bf15053909a844fa983a369a9eeb4d7ddb9753a57. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/TCABU1465274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3dcb505cb41900175037b5b1475d29c3cdbdad13fac98e374f364b9856d80bf. 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/TCABU1465275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b2fcde8192e9b3d3375c93e50330d17ba1bbfda2d7fbafef627248c2fceb7b. 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/TCABU1465276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb6b94e523ebf56f0cebe1c8fab30b20cfeb30a462d67684ab1e578ee172c7d. 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/TCABU1465277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c5f59169338e0208f69e6796bd649472a8d923ecbab48bc603a22f57b245ee. 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/TCABU1465278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcd7fc3e5fe8b2d3ca9e6b4292d84b29ce98a57907287a4df030fd23b4dd1ac. 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/TCABU1465283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7496eb51e025f9cfc2f0a1f645222495180f1c5905d31f977a7b70e4feb842. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/TCABU1465291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a793116be155f6a24ac2eb94af1c1f81c2a525917b6ff420137e3a5c9b9b8e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/TCABU1465293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc805a1c60fda961027d0dff5f875157f163088670678f5e5caa70791f4172d. 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/TCABU1465294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7cb36793d3dd36519ab69ad58c1cd2f309182a0cd867b64f3003130df0051e. 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/TCABU1465295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae57e0bc437875be9db4accaf09244027b7f81e365263f1630e006f242b392a7. 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/TCABU1465296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69def4697ef041c1e1da6391b8c44cf30fb5f4a1851ae605f048a039af45f192. 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/TCABU1465297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28af9faad7f04036bbb141e22ed1b51fdf6ba47eca93dc4f45c68c3871f2c1d. 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/TCABU1465298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbd9b742e5603159f915287491180bdb156af69c7c82e3ac040eab67ba11eeb. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/TCABU1465299.