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 0x6dfbbb756e691c73ff8c1af99a270eb0bcb45aa5fe8d1a69dacc71a453963312. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81def6b7-0a65-431e-a706-b1afe7a43039.json and https://artists.proofprofile.net/proofs/artist/81def6b7-0a65-431e-a706-b1afe7a43039.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 0x0ff2f550e17627479e05ff790eeef8d72665350ca570dfdcda5b7a8160c1619f. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USL4R2122309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263bac278f442f749696d776c53f136392e48845b8d79896606e7a672c76e0b8. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USL4R2122310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18abb7a6d3f729fa076d654fad24db78acac708f8604ec595a19e34e05b6c00a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USL4R2122317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5256f54f4ec0ad2f127c0ca8338c079b852da07d65f6da705822f7ec63790cb0. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USL4R2122318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf3849af591d1be1993d98a8e5632133610907d1be24ec338bb32539cd7e757. 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/USL4R2122319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c1a0a0f813ba1559bcb22e8a5ee6c52e7971b0bab6d1c8e219ee9ce55900f7. 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/USL4R2122320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246565b693b950d70f7a51b58f187bef11f7aab68beafb6d5e60ed474302c9a2. 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/USL4R2122326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d17f43da8035352328305c4b5e2ce36a99ad28fa4b54632bfe571dec5ae6b09. 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/USL4R2122328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d568afe94c77245f6af100f72eeb99379ba8ea40656c1d6e216b24ae61c1ab2. 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/QZGLS2318405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3341c66cd5b5e8ab1909dd0f3530ec0f744a0ada3f60d8289fde5feaa08bff. 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/QZMZ92389445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9497b6888c8614ff3fec57f4ac47b5507491709db0f6155a77adcb6b70dbfde3. 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/QZMZ92389449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516dfe8528dca58fcc1da7ef4648bfdbc2189b25aa0c50ef7a2276905bdff941. 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/QZMZ92389455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe755ccae61357907012f4b712fdd40035f20a79d3827f87e7b25726b715ac661. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZNJX2209150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd20261ebc90c5b02c172bedbe3e2d87570e62c92f0b27684ede890bccf77b43. 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/QZW9L2447234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb7f37fd225ec8173384f2540e4d66b94d7061c0ae795d9b5fdb78322400932. 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/QZNJX2489223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038f9e532d0217be75e9b0f47928bf467d39b2a9ba7f8e20367fecd27049e16a. 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/QZNJZ2295381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a244bcfba74b70b80aae742551ba922f43e9ffdddf952d8e2af8c2cc4d8775. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZNJZ2295389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26f90651d81034cd903480144bd9eb616a57bcfa268480fb518b35eb7ffcb51. 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/QZNJZ2295394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b0e53da90d2c2963c81b61b5542f2f8fc916e13baf733f8748ad676a1cdb5d. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZHN32542152.