Portable Network Graphics (PNG, officially pronounced , colloquially pronounced ) is a raster-graphics file format that supports lossless data compression. PNG was developed as an improved, non-pate
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 0x220ccfa39243276ef2f026fd2f114e5a7d6f64ff8d4a0dd1940793a92511c967. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c2a263a1-f4ce-42a1-b209-04a6f036851f.json and https://artists.proofprofile.net/proofs/artist/c2a263a1-f4ce-42a1-b209-04a6f036851f.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 0xcad2904c424de6348e7c55c3c509a33f4187cfb18dcdf62d383055e201804668. 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/QZNWQ2027898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715f4cc6f9c3f222651b0a05ff21a95988fa056af9a115f9884a6f780ebb68ca. 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/QZNWQ2027899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b0076ccc1007927c3c4cab016adb3857d88848ec08139b908015bb18372915. 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/QZNWQ2027900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7ef8b47fc997808c0f392a9c09e3e8bab05b17098363a7d200c859999f2cf7. 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/QZNWQ2027902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d4e16ad6cf023df6e118a8dd605f4c0d00f2ad6e73b68b115128bfd18ef055b. 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/QZNWQ2027897.
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 0x1914017e586f1a8b55f74a42c556a924b2c9b1e0e5316079bdbaf3f056011ac6. 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/QZNWQ2027901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2dd290585f9cc5ae6e95da8e410669a4081210d197a461301ba2f7c8bab4de4. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZNWQ2027903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640da76795645d48ac14444cb9a35f43c279f15a6ad3facfaae2148b0b2bf688. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-21T21:45:42Z), 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/PT2DY2200088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb4b33a926a48b71c55ebbecd0fcef0ac9c6b5d7e0becd0d9fa77ca7e2d7472. 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/QZRP42132521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cd58cca5e39d173890afd7c98d7e0bef999fe3fa626fc15a56bebd0283a397. 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/QZPLS2000507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433e56f6198e4bbab88481c685ebe0e116bb5ca2a831eff0dd56da33d41634d6. 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/QZK6H2030267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a92042e66359b3ebf3f60eb24ea861f3385ecfa87bd93d2ca3f0e217bc1fbba. 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/QZDA62085781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4568ce57c246fa201acb01aaf9c44f49000a88a25dec6b411a37ab9cb70b18f9. 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/QZHN91923968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde40d6ef21a97905d1e82d90b63425c6b4746f40c323a7d577130b78e81c238. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/QZHN41937993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff8d2dee9d843a86842135edae6fb7451936fe029819406cae7ff4ab6674993. 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/PT2DY2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4070aa15b7c13488054b1cdfe3e009a11ea40a2c7ff60efdfa23831bb982dd7. 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/PT2DY2400164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052c59f3059537f179481f2229af5812d7a441d4c7318afb03ddcc4f4263b91b. 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/PT2DY2400165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03bae028eaa767a3f051918be9ad2f30c56b60d795e38932aea23bb28831aab4. 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/PT2DY2400166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef888d1a32863f42d02130270d9bb90e9b5f18f5e4ac76ea716d1d5f0fa5c18. 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/PT2DY2400167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77160a17a2e6e36f97c5f81d6eb338ef24862c4dfc230578688e6555c01d0821. 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/PT2DY2400162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e97e4b3d4c0c25e634039038c1c663094ebb6617241614bc4c1a9e8e44846e. 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/PT2DY2400168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41e8af73059ffb7198f30fa58a73c17cc9b1ca96cb90ad6c3575b313e3dfbc3. 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/PT2DY2400169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a4bb5a79adf0c481275766458bd1a986c04284cb095b5bff3b0a21db41496d. 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/PT2DY2200071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0208299f093e1813db1cd13d8f02e028efb6942f913be5ba7f31ee5adb8b48. 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/PT2DY2400170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb586521ec7c56a5fbcef9cdf2264cc6ae3b3a16cfc48c1933855606b4383a0b9. 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/PT2DY2400171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c40e9e7ebfd3c173527028840de0ccf699e7aed4d9b80ca22764fa516d08d9. 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/PT2DY2400172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527d52cf6c384e047f661e4f1dc7b42232c733c44c44ea536e94186e04a51d2d. 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/PT2DY2300723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4dc66c787ce5044746706cd59bfd9a79b88ce4b6e4442a674ee7dcdff0cc772. 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/PT2DY2100268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7f15e7f70f8abcc1da457ca98e1bba09452a80c21465275d81ff63d9b474b5. 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/PT2DY2300360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9460652aaeb97d715b013050dbd83c079fd3ef4ebc23b7aca1442d73183b5a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZNJX2432484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dec359aa4e64db3c5667a047da1837b54a017e7c485995ec935b57ca6d97aa1. 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/PT1JV2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7365d1862f5457cfcf163a296023150a067ebf73800078d9ada6b4494f1929cb. 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/PT1JV2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d874b6cfa3ea81eefc79ebb46cfd9e5704cc8a0f79042dbf9136df3ce78eef. 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/PT1JV2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7a26f2e34681462329e623cf42028531eda666591a46473e107450bb3ca413. 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/PT1JV2200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38412a4d8d23d1149d2f4a092770c75c0c57b7695c59b404f5d81b0f79c504bf. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZES81994292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e6775cfd55a22065377c072729a1ea26192695f600ea116184c7ca3ef3b0a4. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/QZES81994296.