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 0xa780880d800bdb1f85809229a77a4d206d7f48748bb22f9d56ce03e9c2452352. 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/b1e45a23-348a-4676-981c-ece750b1705f.json and https://artists.proofprofile.net/proofs/artist/b1e45a23-348a-4676-981c-ece750b1705f.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 0xcd8f0fcfb6e0daaf84bff6f7458374d5108a139bff79598e0a4e169abd69c3bd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USUM72414518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4b4ac7d78a53fd1f71c97cd1b9d1188a5e91bbcc8a76397797329c3a8931fb. 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/USDHM2209739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a16a7fed51f1dba4bf3b5a05f2d5500772da2afffe03a0a55894546d57c043. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZFZ32343284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1821991a3fa01b1c16c779346da9bcbadfc82b35073f5d5362e71bc22f5c737a. 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/QZFZ32343285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f0355b249c0389651e2e3bcc6357d57830653be092b2428987c935d1623974. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZFZ32343286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf285dd2ee3e790a0f219b0e4925ac8afb77ae580d565e91cf28f979024281971. 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/QZFZ32343287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39df2cd6bc56df32f7d27413deeaa404b0a6c1822a5bfc6a4b9c6d4290c75ed. 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/QZNWT2228802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfafa5101f8b0ce8f274808ae91da97d06e82fa8745de0fb111b62624b4dd575. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZFZ32343288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa32864b637bab25838c5cda4239a2e7a62cbb68ef90a8c34fbc2f95a861eeca. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZFZ32343289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f81f0e85bce9a165b64147b8d22187d001af660444bd3497a54bbdeb9caa98. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZK6G2237956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d42bb246c3630cdef9104336e33e9c8932af6a78fd7031671f647f872fd868. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZFZ32343290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2616f3f7bd3a199a89f30ed2a59ad66360d5e81ba90cba64036b5d17df69c505. 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/QZHN62532329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef58fa7f2095bf57b1c4528a8621138b020fe1d3e1c1ab53027e19c263c345a. 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/QZMEN2489584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa200f903c5fc0345236de681b19366df7e47ac54c6214c83fbd749883b50cd86. 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/QZHN62406715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4b4ac7d78a53fd1f71c97cd1b9d1188a5e91bbcc8a76397797329c3a8931fb. 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/USDHM2209739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae4c2b2cae9e7058320cd10c1b1bdbe140b89f8bb9f39889bc499fb2110b7cd. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USDHM2209740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39df2cd6bc56df32f7d27413deeaa404b0a6c1822a5bfc6a4b9c6d4290c75ed. 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/QZNWT2228802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f81f0e85bce9a165b64147b8d22187d001af660444bd3497a54bbdeb9caa98. 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/QZK6G2237956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6178b1aa68e648e789a94634f407700769f910658f7f542d8e3b5421fbc12eac. 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/TCAEP2058481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603f8c9a96b7c6f3516682a758ca52b93a1b20b7b2c72becd8143ad0d1be3f3c. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/TCAEP2058485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x117544e7033a106f6e834431980acdc2cd6e49304872c08ffd2486b9a2eb8306. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/TCAEP2058487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816d0a7531055213e53149b13c1812a24b05f3aff3a7c8ede66d1de7474c39e3. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/TCAEP2058489.