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 0x5d212cd14262391fbab37f80954d05804200238aa622683f6ff94319360705ca. 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/e6a3713b-47a4-45b0-aabd-6e3473e59267.json and https://artists.proofprofile.net/proofs/artist/e6a3713b-47a4-45b0-aabd-6e3473e59267.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 0xa4c889520b0ae129d0e851732e38c0c68ed141b02398e6b740a1d27232512ca9. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USMBR0907114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6084ba721a54a731647eaaffee199c80b7e8100a19b9e78944f5632196fef6. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/USMBR0907115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4123733ed564e2f9bbfd092f3e70ce64b95f06f5e97ef7c34dbb7587e33bcdc. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USMBR0907116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30047a86ba6195514c8d3ca411f981cadb4940c7b9b6b0fc594efa4ddb340522. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/USMBR0907118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2f279a1446a07320f23e0b3efe017b8e59855fce068921199ca1b885d403f7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USMBR0907119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00642f567fcc777f0b932e6037105bdc6482efcb66553adcb936c213df51f5e. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USMBR0907120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab134ae712d1d6a3a600af444d6f9d9daf445b29e3b334207bb1f031ec12a03. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USMBR0907121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558a780c153fae08a4cf2a7a84eeb8fc49fd16a3f9e62a37fdf908acbe722255. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/DEZ901501240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0cf34b26842db2e2baf41f787846ca95374d6e2d82b41f7f6ea6c387bdc50a2. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/DEZ901501241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997f6c4775b1a5b2c90b2fdce14687911992d570233cdea9692f7af4771f0921. 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/DEZ901501242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b579ac4d63f132ca552fd94eee19c86eb729954f3d7494421133e65391c5d7. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/DEZ901501243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449a00806a4166f584352025fee9999ffffc24c498da9f0b61adf0e3491c5a5d. 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/DEZ901501244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450c133905a0872cd0060983b1ee3a44f23730cb5b4aef54585cbd5b54051b09. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/DEZ901501248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b1e19b9ec1bc0de02e264cd798749c93996508de3ec901d8e2f7a07cf929a4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR2X41945073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b37df40afe510624c112b25632c0b04aad767ca1305dd71380a2c7550da3270. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/FR2X41945074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8bfbc3ea78f36d026bf262352ba115aea162615febdd80b2f2124bbc8312f7. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/FR2X41945075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee8f68fd5a726321968ae82686889db78aeafbf21d53546fd1a9cf355ef2a6b. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/FR2X41945076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db7521482cda816f445b67c869f988b8901f9b820bf077b04b8044309733024. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/DEW272401676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3555453abeb8e70575cf580d27d290e70508e9c1f148bbca80105d81c4e461d8. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/DEW272401678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11dcef2335fa6c7a132149b377c70765a87b9d34215ced511b481056ed2642b3. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/DEW272401679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc8b5c1f13cff3f9b6e017a83aa60ecfc51d6815e1ce216d2c6095bd954baba. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/DEW272401685.