thumb|Bottles of ink from Germany thumb|Writing ink and a quill Ink is a gel, sol, or solution that contains at least one colorant, such as a dye or pigment, and is used to color a surface to produce
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 0x16c2fbeb85dd2ac31c42496ef6762cebfefb6e99c705befe4b44f3a57f36c264. 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/c21c9e65-6e59-4578-a1ed-f3d47716c74c.json and https://artists.proofprofile.net/proofs/artist/c21c9e65-6e59-4578-a1ed-f3d47716c74c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de35a5342d1d0e3aa4564f052d66022e390708bf827f8f93930b10ec09d67ab. 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/NLRD52350359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de35a5342d1d0e3aa4564f052d66022e390708bf827f8f93930b10ec09d67ab. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLRD52350359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69c050a84e7d2332d0d8bb9315ae021375003b570f1dcff4023a742b7e7c0cb. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLRD52350406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d7241b0043e5e44f28b8f1137747cc094ff5e6b25735115f31231cf20f103f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLRD52350388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbabf3fa6ebc13cd30150ea6057df35ed3e0cd643f657e174ebbfcb7420fdc4. 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/NLRD52350394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a015845f8dff93e28545dcb4939f1f1efe211e2e35b5c4eefec82d2fa36e244. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLRD52350392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29f05bcce34f024fde155280da9abce8621c301c0757a59ca1c3f6864c5151e. 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/NLRD52350396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de35ccf37ed7cbcb9c6331dae3a4309d259034c272123cc09fbd34fd06f9970. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLRD52350400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde3e0a9de3e872887dac66b61012eb18660fd6aba3dea961308530deb0ce2e0e. 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/NLRD52350398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fb6d44be6db94f6e6e477dcf4e474b5bf4741e2be1e03d7f87e91e89349599. 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/CAHQJ2009328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df88a2a860964b6541cec22e4a5aa889d5f9c51ead6005f297bf5c0dd9ba6d2. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-21T16:33:37Z), 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/CAHQJ2008716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a9e82fc8a28ea1e8233ce8034a669ebd4c03e23c35508a2996283513e8c23ff. 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/CAHQJ2009341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d5143e089879cbfb21de1838cac678ffee3d52ee4806e0e71a99ab5d2b148c. 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/CAHQJ2009345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace1f9629292fb1ad297e0e4284c3e0ce7baf0336802734301cf7a25ffd5c704. 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/CAHQJ2009330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7470faadeeb7400e86e5cfe1b3a17437e40314c901430b0a55298db6dced69e9. 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/CAHQJ2009729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ca024a1609009308f8dfd3411c3b04825c7158c9c984a13ba6fc69681beb65. 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/CAHQJ2009829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10bf81b54e39ebaa85b3a84e71345bcbfced7774970d9e25425b97a4f098a9f. 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/QZDRT1900204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713d550053bba9af086def28d263abd70b2f88a930f36266c3c7a3295d32a71e. 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/QZDRT1900212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ebc3d17c950224bb464efb2fc5228052e2fb2cb1f6683609b4441dc945ac73. 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/QZDRT1900232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c72801eeda503369b345daeb2443b3e1c0577df95408596f62b33278579c69. 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/CAHQJ1881471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7647da76fe76afa4df37f6e2382e0f90efa54317b57546590d7b4b6e7a2a3c. 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/CAHQJ1881473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1aa2748e1078b1f78411ce99066e0e280968ae5716ecd17c314ac0d467d48b6. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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/QMJMT2103872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d7241b0043e5e44f28b8f1137747cc094ff5e6b25735115f31231cf20f103f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLRD52350388.
Don't Check On Me (feat. Justin Bieber & Ink)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b39e040f7e48dca6a25dc8f9f71428fc3fb65489442641e193255ead9b573a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USRC11901588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5de009aaafed3a879f0535b52957199b1938e2766a7e0166d9edab00599bfdc. 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/QM24S1922231.