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 0xcc21c8903586d475eb285c2aba5820b206405e59c785e8874990a7a32c4c8be3. 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/9e99d211-1518-4a21-b224-eaaecf8148ea.json and https://artists.proofprofile.net/proofs/artist/9e99d211-1518-4a21-b224-eaaecf8148ea.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 0x73e2290833a0c82948f6411b926cce0f652f34ef5807715b1d7dc1cddb3082d9. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/FR2EI2101680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456b74798243a2aa18a25d1d430cfa488e337abac6d83bf1b8a9c687242374af. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FR2EI2102090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a86b6e99175f62b87cdacf8318a1490a7c46ece074b577a6fe8178f966b17f. 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/FR9W12131806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d3d5890cefb0ec0a93d652aee4edf878ecf6da40b4c08d3f42817c323c50d2. 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/FR9W12131807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcc27a3d045a3d12509c361093f55bd9c4db6b5974bcce6a13e7214599e6ef6. 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/FR9W12131808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683cd2310955b0a45b89d63f0f58bec5c69a460f8ecfe779efc719e42a5297e4. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FR9W12131809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb419879c994b53743576eea816ad40e9b9d2aa43bc4af3eba336df65212f88c9. 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/FR9W12131810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838c555b153c437d41a639e19eacdf6a43a1c53b84b02cea501c94830cc8bd7e. 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/FR9W12131811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cbb0bce486a5980b343996601cbfe37d753a62430d08040ea0a61ea72c5f16e. 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/FR9W12131812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x741a8ff7fd72c90293e8b7be2db9ba1706ebdb1754bd0d3f0cecf06c842be2cc. 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/FR9W12131813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3c0d238c64c2af0eba6fa241d4811479294fb542f61038a14e2a66b8205caf. 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/FR9W12131814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3041a9ef5cba0d90a14b9aa9126198ced08ada08d3fd5c165394c09cd625e772. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FR9W12131815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba04763dcfd3183a77869ac1106cbfd0fad5e77a6ad293b96f65ff33d384fe4. 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/FR9W12419119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc14ee2891bf0f00b1fd674b7ea7564154b61d4e6f37052cda0def8403c73e899. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/FR9W12405824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683cd2310955b0a45b89d63f0f58bec5c69a460f8ecfe779efc719e42a5297e4. 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/FR9W12131809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d3d5890cefb0ec0a93d652aee4edf878ecf6da40b4c08d3f42817c323c50d2. 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/FR9W12131807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838c555b153c437d41a639e19eacdf6a43a1c53b84b02cea501c94830cc8bd7e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FR9W12131811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2736e54ed0cb7ea99fbd94348e12ab4248e952cc8bc035278d594be2e52000f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCADU1870076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9efc18a3d4fd08d3c07a4dcb6c1623ed7ceca45e0b8a1e273153f985dec6c8. 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/TCADU1870078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6123e46804c07d367760e34200f35fad2d055b4df9afb15b35043010bede7523. 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/TCADU1870079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe82f7a880c14895700854046477771e7443e0d70be942fa5be7ab4c8e3a27c78. 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/TCADU1870080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ddf202d85f39b7e403d975f1255171536a53ebb805708dcdb9810537b82a4b. 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/TCADU1870081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671df280d57f94245dc81f13c48a91c85deedf2b4a149ecf75349c33382cd514. 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/TCADU1870083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a744f083e970aabb327d763dd921d118fa9ed102ad2fff76ae0bbfbdc4b2b69. 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/FR2EI1902967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2803de4e9a497697723861f1d414f8fe0d986159754c8d6233b8b1eff27b1b0f. 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/FR2EI1902971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5213446512a94a5f1d74f514062c0ed8163c98cbb81358da5a1ac4706dccf5. 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/FR2EI1902973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829a676c6829263442dd3e855f080d10c0a6b32ee19cdc7c7e247f9e63a03c2d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR2EI1902974.