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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2c7530baeda9c6e4d00b66108f8254a3f884e5b494e7378452c668596cd967. Chain 2 (Bitcoin): anchored in block 953691 (2026-06-14T20:39:17Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b01f745-8a60-42fb-90dd-8bec50e747c0.json and https://artists.proofprofile.net/proofs/artist/6b01f745-8a60-42fb-90dd-8bec50e747c0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2731e86f0ab2417f6fb8cd3f6e12d61174cde27ad53c8fed4a6daf8d7f828033. 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/QZTRX2414957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a67b097b66c10621e179e8dcce908447a39b7f8aa7102bd223f2bc31090f1a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZS652329512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63241a0638cbaa523eb6c6d1f2806e92b51a7c8241899c7287c034a5b0cec1bb. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZMHL2347707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9986f6480aa352ffaf5825937749fd2b12d9a90bda32021ae5e3717728e43109. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZMHK2327501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ef3edd458d025be50ead3866c891a19ea4da15f893f39f6b549b0051f8d8d6. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QM42K2305272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3952b005f866fe5c72b5c1ddddbd7d7166d4a892df22612baa62dce83a094124. 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/QM42K2316174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08f097e5b7df558d7258d03a9bc9d9c42c13e4b56072129ce79e890f8dfb254. 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/QZMHK2306747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f6235b2ef58fbcbf09edd1b8ac25b9b370a7eb97febeb9ad5201a32f67cd7e. 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/QZMHL2322784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7388d5feb8b226a30512315d55d77ee3ee8c3594ee537ce1e17f751f3cc06c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZS652383272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcbc4d33f764a712b6ad74ff7f20605d1deb086914392d7c242baf637d0ac01. 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/QZS652382232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8325bb7611710a5b59628d951edcb13b89160dfe95f2e4cd1de3b781b59c644c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZS642307029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3530da4b2eede4b14bc1716bc6163b773f42c45d698d2c4e7a54a755c26c44a7. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZS642332008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a67e8d8742bd3147920790ba0d0c643d98d612e00c64a9ce80a0e707cfb166c. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QM42K2346223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda33e4ce344b0ebb630a5cda9ded34203bf0528f09ff9093d7ca93862d31ab3. 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/QZMHK2385671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55a4420a9b41038146d9bb9c0b0b1f1ea0a09644240ae409ae7d60c549db71b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZS632386784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c114bfa078cc9d7cf2829f0a944495315204c4762f76d74133e2f88abf6c37. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZMHN2306370.
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 0xe1f61c4a50b82666429ad516e10aec46ac4c90df3b63dcdc225f1b10588d133d. Chain 2 (Bitcoin): anchored in block 959109 (2026-07-22T09:54:32Z), 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/QM42K2372520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9521ba012eb35523887274443c797639f431971522e8d10b907cb302e32669b1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS642310087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b625294466d2596af68db02ecea5dbc79086ef98b659de3169a251ad862e9b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZMHL2384917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af384d420f1e6d33a9764f38eb750e63d158127c9c9665aaa95c54e86dcdc62. 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/QZMHN2376184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560e23a2b8dd7e9fb3207aab0c527f26f2b3247f8ec3bb0376529d621c5c75c6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZMHK2302326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fffb96963f30391f874c42bc6d5fb492da3e97c1b026ce394d0e44887e9fb0. 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/QM42K2351690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd52593eaa78ee5815e23f2dc0403ff7990355d52a5ba2970489af6d3e7ea63. 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/QZS652373243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109fb0e2c0b2d9bb7d6b27972ac1f457b57654d9b50cb7f384b7961b4a781286. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZMHM2366641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0857b5a9101f3891e80378b8f989591a826ce6c86ca4b1479bd2a0f58be1104f. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZS642369264.