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 0x10a395d5fc9ca327bfe591081a313636b44d29ca33cc5366cc4f82d2f2016eb8. Chain 2 (Bitcoin): anchored in block 953670 (2026-06-14T18:07:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/58f2015e-7c26-4f1d-b1f4-2b6b58c7c0ca.json and https://artists.proofprofile.net/proofs/artist/58f2015e-7c26-4f1d-b1f4-2b6b58c7c0ca.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 0xf1334cb7d46d95ea275b032bfd4bf0c3c042a080a4c8679ceb79c1d3c3b61dfd. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/TCACZ1711955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44bc2ec6d09dbb263807fe66604718d8e227af5145cf9c4791dafd9eb348f8aa. 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/TCACZ1711957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee073de09811842469aea54aa0370d07b46e44e18de9a9bf4b69cdc6ac8987e. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/TCACZ1711967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4e90a7bd4e576b65d7c94e3d3df3100a00c5f85b1412f7fd95f6d3ef167749. 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/TCACZ1711969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64aa50315f016fa0a167c34e1a5e791fe6359cd1d4fb4b63b29717710b816bdf. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/TCACZ1711971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39608af4b38b7a182db223691ba3115ad2c51d528879840a966d2d2772708440. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/TCACZ1711974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90a99e35001588aa96a7dcdbb4dd16baa3c844e9a5d8fceb8348ca2a57e0b0b. 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/TCACZ1711976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1801b6c42bbf68c170a299e27f5949dbed5613dd302aaadb95e195777f6e0398. 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/TCACZ1711978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x760fc896fd930e3d75618f44f2dc256c0c9f61fc0fd1e83aa0e2e3cf838acfb0. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/TCACZ1711980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818f37ded2d59172309b13eff5020d1f197aba280524c500cdae7e579144254a. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/TCACZ1711984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836f128481db35d3dd5ea2a8204b171b968bf6b9440d4b6e9d3b51101ac77fa7. 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/TCACZ1711987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19b824c3211e099831660abb4131f81b0ad4dbdd854c92de2c0dd30fa3f6b72d. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QM9AA1615754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a02e7d392d091c60e6b0e7238acd3f64832024fc66621d8f5fb2264bdcc5b6. 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/QM9AA1615755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a451f0dd7818cdfb03a2e4be73cd24acaaebac6de06349a8d0fbe2cff38b1eb. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QM9AA1615756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d007a4b5c2e4cf884099bae45431a2d18071f1939073a924359a544d8cf623. 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/QM9AA1615757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a586c71c4ef43d4ebc639bf041a38e96bca89ed0057ab4acf54db274df1b764. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QM9AA1615758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba54b9081d4530ebc29c03aef3e6005b61859ed55a1daef8985a07498db1cb9. 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/QM9AA1615759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5af963150ecd69aa918ce580ebab7a4fdbd4e0f914544726bcd8cc1b9feff5d9. 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/QM9AA1615760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f5e86866dfe483f4d8ae781fc3375e78c8c48495acc5ce1e5eb33a0669777a2. 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/QM9AA1615761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29959e2975a6152aeb17a69fe2cd05b532d78e1fa6fd0023f2ff3f3e5e462ad. 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/QM9AA1615762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c67d2bbd82ebc22fc310e3e903ec42a1e92af39b70942e97e719dacd86b430. 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/QM9AA1615763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa773083cf0c9d5ad6179f9fb61917390539e712ca2cf6414f43942a2db926ff6. 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/TCABI1221079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eade8142e067e73de54c05e52e23249926aa6857c9e3130bfb123469c1dce8d. 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/TCABI1221080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028a82132bb3777bb819546f08e70fc1cbd2d0879c01bfbebdf11acc3790061f. 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/TCABI1221081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61f9ffca9615429cf455661c098804cd46869f8a69a349b272321804fd06a37. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/TCABI1221082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2073491253c459a6a974b4a3de47d69720b6e2210a8962c326355927bcdfdc59. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCABI1221083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a3ad8c5b7e8db7eaea06461b76d0bb39aba529f3a7287f61e2f3b9f5113d52. 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/TCABI1221085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f24535c36d70c4de1bda5520d0c31f6e7fe5f75bfccaa76e6d231c503eba33. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/TCABI1221086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1f33d567fb177a30c4dcd2423b2f2c8fac9d453735d1163f0a20799b777558. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/TCABI1221087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33838c3e26c53c38cc90677161e37fe1071553bbf15ad1a6e99406816e3e74b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TCABI1221088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64edf3893efb019e4a7ae079df6cc456e18f539a09598f72c6273ce2c39aee2c. 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/TCABI1221089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22b5790c964ddf1d81b70bacc9fd448a10c4353a87f7d698d5db4a167bba197. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/TCABI1221090.