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 0xda461a330574226fad9f6646ea28ca29cf9280085cb88209550082545f85d37a. 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/df8a88f5-880f-4a44-92b4-771000738272.json and https://artists.proofprofile.net/proofs/artist/df8a88f5-880f-4a44-92b4-771000738272.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 0xa2d8726e3a778eb9f806a337d48521ca155a045f8b393d9cbecab755fcd4db43. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/USA2P2141647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d360c801a7c2f88a31d0403920650f64bbdb813929271a0fd4861472904029. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZNWX2089744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b004d4910995137baccdfbcf4038fc4eb855f1ca059c8797d93ef3fae3d1d3. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZDA42182011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93484f3be15c9e120709a39e82459f9e3f0c98f5e7b911212cf3ac91b1b2878e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN72148617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb260c5c18176b9bd0ccf817dcffe2dec1a1fd4abb6e49d951d18a28be919ad. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHNC2198031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33f8a6036d684155e59f32e0496d62ed0c6351299087aa61b863e90dd08130b. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZK6F2135376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fe1196b3b15f0c2eaafb3cf26bf65da450952f2f4148ab20821da17fadb83c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USA2P2141687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8e71667d6077de35b1273837e2020f978fe0a62d37ff07d2a404c042159c45. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA2P2145600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8e71667d6077de35b1273837e2020f978fe0a62d37ff07d2a404c042159c45. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USA2P2145600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4085f1d2d9f265aa999cf347bbd301f9c28098930f10fbf42fcd0d00cbac9f8a. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/QZFYZ2209543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d839dc810ffc5777cbfa29c6163097003fbcc99f195078ee73f2889b5ae5d24. 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/QZHN52251374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d839dc810ffc5777cbfa29c6163097003fbcc99f195078ee73f2889b5ae5d24. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHN52251374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995375a16c9074598a2effbfbeafbe84235b65caa2e077f8473b382444d6f99c. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZNWX2234107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa582d1509565c3e0f8baa0f09c21170dc096e769183d539e2853473c7a38f8ca. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SE62M2228104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d38e97fed4263247e9393fbaa8183915da1437d09cbcbae48cc7cfdd3ea6f2e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/SE5BU2389717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8b60140c59b98be31b35114800ecf6e602f9f5e7258e0d502d3c711a1fcf60. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SE6I32303811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf330961e84d503fdc0fa01562d0aea703703d78929959804fc07e4fecc10896. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/SE6I32303812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4884a8cbb3d333cbbe6f5acd4a6dd475ceb9b19652dd660b776f3b2acfd87f2c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE6XW2226282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0e4ceaa72ac671d3b71d536dacf1b76f61c2fd7d66237c7039a95e60a93b3c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SE6I32303814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa582d1509565c3e0f8baa0f09c21170dc096e769183d539e2853473c7a38f8ca. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/SE62M2228104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6769c619e20c72d260e26bd365bbb080598c3e870e1b2c5e55ff7cde6cdb7541. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZVEM2348038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45fd14cbf390bee00d2e41868c7dbbcd6191fe8c848c251ad66d3539a47425a. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZVEM2375185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452be9c93fe765631dc2dfb1d3a218cbed56ea52901313d3c18bfbe24724052e. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZNWW2464602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1ee2aaf6bf30f71be2b8251a8f88852f5c4426fdb146bd0b240b6751ac3e031. 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/QZPLR2112523.