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 0xf0b8b0d88be5b5c85090ed58a5120f35375f764bd050d3f96856c966b487e2d5. Chain 2 (Bitcoin): anchored in block 953907 (2026-06-16T07:39:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/17132b16-21e0-42db-8893-04ef215e789a.json and https://artists.proofprofile.net/proofs/artist/17132b16-21e0-42db-8893-04ef215e789a.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 0xfd36e0baa8052f181d1533cc946d5c54f9804a4c00c10533d42c9518b6ec5072. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/PT2DY2300184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0324016d8d13192c96f754763a35d4d0782d929856541feab2ef9392f045b59. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/PT2DY2300189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b688af4616f85c2882e12f80d55b10b2907d3ecb6660f3b83f1f12e682af4be. 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/PT2DY2300183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b65df485f0996747186ab745b9b9fe51fe55e3a397de5107c80932a4372aaa. 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/PT2DY2300188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622a4cce0143c817ff302e9be10725ceebf52c6dc4682bd249121c0611fadf50. 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/PT2DY2300181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6976c12c8eef20ab0aff4ee2df99fac88e7bf347f14dc29f8158f6ac4cafa1c. 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/PT2DY2300566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18ba737ba0af532fc58adfca65ce1c1ace0883835d3db654049ed1990fed509. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZHN32464031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e9bfe27b33c0aa756096537fdb5853b34905a5e02ca9b0cc02b98afea29ebe. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QZHN32464032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31cb1ca036af79a79ad3feb4f03edcdd14e3f376c2b9a25dd1861185c8d2ec37. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZHN32464033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220eb453b1f15d31a83854bf1862d84ada725c68282189c23266eb0123082c4a. 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/QZES92452761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a4325131e24b18beeb1bd84c628a09f3599c8dfe79f9d0012cdb0eef27bfa3. 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/QZHN32464034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e98a272a49b132eef4e12da3221b591ac587d06b7ad4d4016cd4f31557d29a. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZHN32464035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b6ba19f5262d63c1ed01abb4ffcb563fd9e33bb33c8dbbfc82304ba76f61bcc. 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/QZHN32464037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf428777e02cd3bb23b6151ff1391bbadb2f2096353886d97faa1ecab104c0103. 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/QZHN32464038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179ccde963fefb6a589962abd791034cb0a435427218fa19efa68c8c2a987c22. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZHN32464039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4f963b87512bae6e17305cd9b68dbc61acaa4e546e9a3a962bfed280460690. 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/QZHN32464040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9fa5fd73e1ffac51eeb2a2ff69e78a92b11e3929054da111a1228559ca4a7d. 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/QZK6Q2321193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcc8cde131ffb44e66944ca2b4925920a66478619b0ef1d4bab8700649d1086. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZK6Q2321194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa679ac274aee9680fb3577a4ffa80bd68edf21bd6374d20f648df3a904916972. 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/QZK6Q2321197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf16d8c89db67b6d16d00875fc859a16b4d8f07cf80d0c09672fe5721795c693. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZK6Q2321203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de426d475b0a7d1049cd220302e5fa9bb5f355ae7670b729794ad2ff0c45f7f. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/QZK6Q2321209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde71a007079b239e29c540bc309a7897bb301962ccfdfcc7997b04a8808403c8. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QZK6Q2321210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01232089ec46d11052cb343fbb859e0804a04e2cec977046fb6c5086b0ef456. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZK6F2348375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe88e8fe07da0a36301964845f62a53c88b591fd384f18470ccfac2b50d5b0c12. 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/QZK6F2348381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8497fa05a6bc7cdcb4f58f9675128cbc8e790754f637b5ff2087f5639a9da9. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/NL4CP2501209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44d67b74f9652f1cb9873ba346a3bb14b264f27c15d3e33d10ee41d22e332da. 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/QZTBF2455601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f05d9160f0043d3a6403ec3134968bbc73ccf09b8854057a22d3d5ee634473. 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/QZZ7R2450614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a90550c0b7a4d12bda0cdf1085a7f26203acc7a4b299287a39880de6d0230ad. 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/QZZ7R2450615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9279d4cf2861b29d56040299e46a83bd017da7968e85c1b857f8e4fca791a49a. 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/QZZ7R2450616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220eb453b1f15d31a83854bf1862d84ada725c68282189c23266eb0123082c4a. 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/QZES92452761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05acf9073fd9dd9f19c27476ba2d4f696e21474ba3ff232a6509ed53e5b69a7a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZPLR2343465.