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 0xbf6500a663f2796a8eeeba17ede16f0490b56f1143aa6280b1716f3a4a71bb47. 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/d083232b-e336-4b6e-a720-859ffe707e91.json and https://artists.proofprofile.net/proofs/artist/d083232b-e336-4b6e-a720-859ffe707e91.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 0xe88b38e0241c37d78c38cdda2ff36d36208543e62223ca94936c6a07b000caf1. 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/DGA082403608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06642dd970b4e173d109dde3e1f75a5b44fa9b821af10135b25644f43264abb. 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/HKC992425694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c9d87c4b697a7faacd060518e802ddb1fc7ca63114a30080a4e05f052ead79. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKC992424777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f922c0edcfa28ee9377d0fe2ab8407d496fa893b8a5cbf3e8123a7b76667651. 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/FRX762491479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170ec4fd3fefcc1a8e7ba87f5803ba680569ff556a06bfe09909ea6e5d588d2a. 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/FRX762496430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726047a8b88bfc5afa8db9a38f3faa4c6e6215c6de04dd17822558f7a4eafb59. 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/FRX762490416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137ff13d87b023474713d30ceddcbb1b982ea15bbc3889ed7d39ff9815ad12aa. 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/FRX202489391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac823df147570b1c7d5070320ef8e79a55f3ef0774e6fc8075eab76309256ef6. 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/FRX202489394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f2c98e48422196593d6f980ea4fc6934e364046505a033e6ab65ff7c387ae0. 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/QNSM12400879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaaec5806a13ba5182dd0d078831d2b62f5c67b7a00722287e927a0031f6fe97. 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/QNSM12402682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x798ae8be097b4b659c655303b22cc4a45e84e82e5f19bb6e11d542fdf014b346. 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/HKC992725703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14631d7f9c5e32969742babddd80617588643bbbd59ac48bde3229f8803232cb. 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/HKC992725423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e16f65f380a67ac0ff23c50fe7d9edcc9466a1e10512816d0c125a14febbff. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/HKC992725422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2058bfac158a65f7966501f412f9ba4e8017dbc25373bb05c8218b2469736876. 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/HKC992725756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce1607162fe5898197cfe078213596406b5d592551669a9696cea2f9167005c. 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/HKC992625706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63fc28cf1dfd7802883bf067d09720f4b93b4e677d31cfef83733c1c8a5c16b. 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/QZXLZ2407954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c7d326b88b15fcbad1067399246040e9f395e9ef1351ea54602cd52c946200. 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/HKC992625815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a13c8cc1b6fe773142c3c5d18db1cadfcd290a443d744404f80fb078c72300. 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/HKC992625880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f8cfebacaea3fdac792a2fff0dda0eb8d39e2a1ec865c39c41415067b94ef1. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:41:20Z), 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/HKC992624987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a27d237b5bc6cb36132f4c1fda1af09652a27368172a7ae98064c1c830fd77. 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/HKC992624459.