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 0x5c9ee7291ccaa6116ffaa7c17d9ded25498b46e2e977bddce8e8771da8d3a80c. 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/76e3a0aa-dff8-4284-aea2-02ccf2d6e09c.json and https://artists.proofprofile.net/proofs/artist/76e3a0aa-dff8-4284-aea2-02ccf2d6e09c.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 0x5215f4c260b4b778d1a4122bafbf49daa01797b224bc7d17e832766825c66733. 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/NLRD52264215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275e24d2004db797fc350275ddd5340c85a974d54eb35010ccd8336270f905b1. 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/NLRD52264216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15988c7e2107d4258b55ba10c5ac8132d7cd93f86a174e1f05b29b31aa91e2a9. 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/NLRD52264217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc911483454421cffb5b54b4fd14bf2344100429051058b50cebc97f0fe1d824f. 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/NLRD52264218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10d9da0fe921121509a08543f59defc32c7feef9e478b8df9077736f0265dab. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLRD52264219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921a7b53ae4f07b5e4ad88c0058c6271755d6dd99715495a219459a0d5250d82. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/NLRD52264220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d3f0d7e4ba7b9098e58b375f9a91fefcc10fbe2dd5057e13aafeed9cf4bfd8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLRD52264221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e02b09054a8f20d0ed87afb020271c2c907a52069b3a774698b900f4787b1a. 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/NLRD52264222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1dc1bf5bb36cce6aca8ccf70c7db62f81048ca675c7d0ea971b033a3450546. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NLRD52264223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f66f2539ee3a2b67878c231623303bf8f419433ca13bfcc04f5b2b47fc9afb. 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/NLRD52264224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61950940d295d15f9e6cf60d6645dc8b52459b73c4996e1f41164fdd5b1cfc8d. 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/NLRD52264225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c9d71c94a3688770989c9b0648998282f9f835fdfd7add1697bce60fe7e63ca. 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/NLRD52264226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37588f5a9c46c737d99389f15ddeda377ee4b547c39b569f072734ea250e84dd. 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/NLRD52264227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b958669203152caf3530c935225651cb457175b2b75bf8e998ef3e7844e1885. 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/NLRD52264228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9890b3f895a1d611c51c449f4817395f7180003607123ac1c027957ba29c0468. 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/NLRD52264229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7111d27f18bca41f8e1eae2c6185dd126042fb3f797581b882e206d6b6838dda. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZC5P1800322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f64f2abaee11e4a8fe684dace9c4d8e52e16e96e87704aa357fe3a3869abf2. 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/QZC5P1800323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x168abd9dedb82a4fd8431898f998313156ac00aa2a8831fda3f522a0bf755349. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZC5P1800324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba5198060421e775ed4ce720f2ececf246dfadb92f4f743854102780b713ba7. 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/QZC5P1800325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7cc88f2fc4a10c5c1b617897202c8b731a415947e72286ad3e1d0707505d6c. 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/QZC5P1800326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68f8ba81b5203b7b17a7104d3ff5f4935318eb66f67f1b8cd9af7c70cd8514e. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZC5P1800327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1e2e379fc3ae8864ded705bef36c2abbe73032e3aa93457469a61bf1091ca6. 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/QZC5P1800328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x459c24bbddc93aa5a550eae3bd91c6b2cea2f3bfc14a5098492863a9b85e412d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZC5P1800329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6d2323bfb0da6186994c50092283b9e9bd23dbb1b25a743335a0d8fd506240. 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/QZC5P1800330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1770ad551cc18450b0e043b5a4abb0577b070f28d55223fd2fd739c52320e851. 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/QZC5P1800331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8366eb60929adfba537697185e2af81372361c84b13c834e879b4216246cf8e. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZC5P1800332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618847aa0222b1c27f85c0afa18bf93fe8e845e1921ddd8007412a989cc6bee6. 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/QZC5P1800333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc16742176e57173f8b2eb996790462de242fe157b168b298cee2ca86d1c086. 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/QZC5P1800335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee0d335be8e4f5ea65db8c103c0771a19987fcaa862216bd68d96e493f41f5f. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZC5P1800202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347ab37d92a0a7f9600f09e4c626ae19ae9f411906c0bd21cb07cb2df1a0e665. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZC5P1800203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7904d17e0f7aabb8b1c4c6b8ca4ff51544c6fa924672d6885751d6d2fe332412. 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/QZC5P1800238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55987932cdc82981ca5bd7cf873940ab4425c44bab1e2e0cbbac9617d162696c. 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/QZC5P1800239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0b00c51a954c9275d230d7e2c789b3303b7bbbf601f192e77dd82c60315f2a. 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/QZC5P1800240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a4cae0f82220e74cd73cf083da76c4e5288b39e895ffc97bc0ac9cd079d586. 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/QZC5P1800241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f14061eeed430d5a2180f0e9f95c0a8dcefe1c849cd2097a7b4cc9a7300c151. 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/QZC5P1800242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18392867f44b86a00b0bf5a567f240100f9e2e63ac24a4c9858c3019305475e8. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZC5P1800243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1ac047bc1133d141ff0d670e34bef751fe062f977c7b0fe52a556c209a8ccf. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZC5P1800244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8cd27819ad829fb3cdc83702001ac91363fb6628826e4d22d3fb77f940c4f90. 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/QZC5P1800245.