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 0xf592b39587f9537ea04d78ee9617bb89ae168f9e567437aad127e469ccfeab17. 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/494fd77d-2edf-4551-a636-b362d1afd00a.json and https://artists.proofprofile.net/proofs/artist/494fd77d-2edf-4551-a636-b362d1afd00a.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 0x4a98a59164f3d5772b6ea652cc1ebfc3e54e1fb2e805ff40566adca78003a97f. 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/CAL451784501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30efc379a7c8158f34c21772189cfb6016b9b26454af7cbff2c68477144525b0. 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/CAL451784503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b5e7e30a4f7ec79bc6623b6d56a0ad3193f7b43477421cd1d4e65578449cac. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/CAL451784506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd951d3ffad09ef064b58258018fff8dee1a3cc05b1c961d2a39f711c5800cdf2. 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/CAL451784507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60666c5c0f314e04ebd2a565ecbd21330beb32f96d9f39511b0fa2cf0c83ea3. 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/CAL451784502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b620b2497da58e0d2e00eee4a501a8ddf21e5fcbe7a68b772ea3f05fa2ec9f. 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/CAL451784508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1024190c1878a58e01bbe59a39185d9174578ad68624cc7ad9c75c25fa34b3. 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/CAL451784504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf7558783cf5ed4cdbe524d546b0834190386f7344505b7573ed7b91a911390. 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/CAL451784505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25cd08a7eb3ef657b24c2b0d35a2fb0ea9e477c05336b2ac98c264da6cb97bc1. 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/CAL451784509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff967807f847ae9c7bfbbb447451afdd055142c8a60c4233652e5b75609cad4. 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/CAL451784510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4416d8f6ce694a01e5f3e464b5ad285cf6e999469140c33ad0cf6d07a108630. 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/CAL451784511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fca33bb9033ba4921f6536dec6b7b17ef451786e0af928e12e5989db251f70. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/CAL451784512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7175b7d113fc02b1870dfc4ffda9f4affd8dcaa532e0efff95eb7565ea119abc. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CAL451784513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c05d0f4fc8dcd60e1bc529769c6cb3ac411a721430c56b36eecea519168e57. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/CAL450694401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1a4393a531772aef1ba67b3f0cd87d6e01389984fba6ffc3c908c32f2a1b87. 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/CAL450694403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e71ead1e43dfe92ce74307c44cc3cc1f33bf7b6225485be5a0e650c20a8a3a. 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/CAAA11816305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e07a065419c56b9ba38c6939faba0066c5bde5f948ee348fbcf50251c7daca4. 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/CAL451798801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e56e6bba643065707c26e77c52f7536482b77943bf0edc23c7763334e11b6fa. 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/CAL450794401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f66219dc62996dff1648e50e7455e1450f1018d816cbf8988883ae00f095e9. 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/CAL450794405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ef1749477f4401a391fe3b6e8c446e85430bb98de0cc7c1455c0d67104e068. 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/CAL450794402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bb91b8a7b3d0c2463e03ae78b91aef06de50d55e26d0592b4547beccb8c616. 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/CAL450794403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249b671ab1f7bde425e927db76a17e2ef64e0ee6f3a29cda851a536b63f5b9d4. 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/CAL450794404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacdd4e0c72db4bdf11bfd7f52cdf31bb6b2e6c15cf6b4fd10e3677dc484cf915. 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/CAL450794406.