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 0x43c84e0a098d2597ccc543de223d70dfa0a8d4646e057f3047785fcd59966487. 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/5a2ef05e-068a-4c17-89b4-07b675cc8f0e.json and https://artists.proofprofile.net/proofs/artist/5a2ef05e-068a-4c17-89b4-07b675cc8f0e.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 0x7a328ddc2a0053b1e1847dd4da48aaf9cbe45cf8c21dcd8ccc893e72cb5189d1. 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/ES71G2403733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55093ce2c5c5f7771b174cc27ffa4904839a1f60effb8f11c50d27df36c1dd0. 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/ES71G2412499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1e5d4373694fb85381c6b7a511ef677eff6bfaafc57f1722210d76c9596c84. 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/ES71G2412500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d7cca5ef677de8cff78fdbc106bf0c7a72f61f501b2442e8fd04e099c94906. 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/ES71G2409493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcd2baf73ce0eb91b35403ebf452d3c29103be0e7a506dc33eca8ab8bdea0bc. 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/ES71G2412502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22570f1e6a5e11b98967d9c732abedc6c58619b870701cfe3ca0a4a9e38679a9. 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/ES71G2405660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52558bc97607fd5b2a6909cc0919a0ca2247f22ed2fe9b969da934a294ebc342. 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/ES71G2412504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22aef8c2cc4f78808563bbcbcb409e5a3a282e2f05b5ab6e913a39483756404c. 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/ES71G2412505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b7a91698a6d8c6e91fde39192fd72db7450e87fcead66d448ff492903111a8. 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/ES71G2412506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe230915356f14a49cf8f88a60c397cb8a8fa9f0bbcb2d6f927ed7c07f39dac5e. 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/ES71G2249134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8b3872d6f49776873b2f9195b702543ee28dc20fce92231e446bbb28dde467. 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/ES71G2249133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a030f107d05e6c977f64e99c11135b9d42d725a76f7d3f96f6c33ff710116c. 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/ES71G2249139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf802e1800504c09e293a253ededd63a109c76fe05767e0d2442ce56340119297. 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/ES71G2249136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49a89303d81a027600153db6403af2a54fd2d69aac5fee52e1c608c32238f74. 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/USL4R2216370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f84cedb3eb12ffd243bdfdba2dc9b5343309f6ffb67d2a315a84f801fdd7d0. 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/ES71G2249135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d5e7799bc8e26bcc208b32c2f6e65da6d41a581e185499aeac25d4646ee797. 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/ES71G2249098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6391aabef683ec04bcc810331811025747df7fc6351f9873f717a94c74a123a. 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/ES17E1900337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef19ffac70219f1f376b8d2707e53e79878200f611c6b49b7cf72c7d4881344. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/ES17E1900338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ffe1706ad48f8e5e8af23877e6fe468ea9c4215f2b1f7d0d4ac557f5d81da8. 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/ES17E1900339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76a7ea518a3cd631e50cbae0f8b8285d18161f7a036e6e1b0d1857e86f8c384b. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/ES17E1900340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1c47eb9b17a7985a527b6010303ab33c7db2e5dad9cb36273a3920de04cf29. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ES17E1900341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a70daf40b33cc2746b5c95cbc33d02483319a6f1c0754737076527b11de0de. 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/ES17E1900342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70d3649f668b6ea72eb8dc7f98dd7efae927add1c41b7913b7cbb8015321515. 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/ES17E1900343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea9c33359c6eadd9e824e59c96811c603a071faf12b45fb86d920cd1abd4576. 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/ES17E1900344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093da4a8c4f37061c3897c72f97aeef9c93fd09a80e328c89d8b84f316f226ac. 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/ES17E1900345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d7cca5ef677de8cff78fdbc106bf0c7a72f61f501b2442e8fd04e099c94906. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ES71G2409493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22570f1e6a5e11b98967d9c732abedc6c58619b870701cfe3ca0a4a9e38679a9. 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/ES71G2405660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a328ddc2a0053b1e1847dd4da48aaf9cbe45cf8c21dcd8ccc893e72cb5189d1. 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/ES71G2403733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d5e7799bc8e26bcc208b32c2f6e65da6d41a581e185499aeac25d4646ee797. 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/ES71G2249098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49a89303d81a027600153db6403af2a54fd2d69aac5fee52e1c608c32238f74. 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/USL4R2216370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f642b807c98528931b6a21d1562bc603afa640866313d5af93a69e3b9d1e7f. 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/USHM92239349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70d3649f668b6ea72eb8dc7f98dd7efae927add1c41b7913b7cbb8015321515. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ES17E1900343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a70daf40b33cc2746b5c95cbc33d02483319a6f1c0754737076527b11de0de. 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/ES17E1900342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808cd461db943ff000c94a2762779265b634f3faf2bec64dbe97287e601f1a39. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/USHM91818401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d77a5feadcf338c588b1a349126b9142491c9cec9b53699273b8e792674b891. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/USHM91818402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4a144b39f8e723a75d26ba00f089150fa2f6739aef6d31d90a1094edae9305. 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/USHM91818403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94256989f4ddad6ea5c374197c5b1132a3f2e847a79acaf07cd9e0e6438a7b6. 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/USHM91818404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443e1e9388d4b58ed7146c5b499e937b27f44295ceaeecc406d0e9490afb5be4. 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/USHM91818406.