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 0xf816287f2bb76910bc358c326430fecc1bbc6c1017e9d47997232b656d668357. 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/f249f0fb-b2a3-432f-bd82-80ee21436864.json and https://artists.proofprofile.net/proofs/artist/f249f0fb-b2a3-432f-bd82-80ee21436864.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 0xd9bf89cb06496090bca90ec714b82c8ac59a03e579a776331d1b17ff3c51ff58. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAGS2213127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856f0b78439dd2f904b847666d2fcb8413a3a7f1cda69742d637d64a74c52237. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAGS2213030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa447a236cad93242d9ad8855b2e46362cd6b766e177e3c4cb7ea211391648bbd. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAGS2213156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a85bd109780d1fc739f3c5597c715eada2e3a67e46c3cbac6413880bd987f3a. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/TCAGS2206014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404a0e9e616baecb6ed469971c1297fd57c3fb2f9bc842a5946e85a3d8329781. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/TCAGS2212978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91c32eacceb958de7a66dcf0684cc05d65fba7140b3759a2cf45354e0e175b3. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/TCAGS2212926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbac631f8700e73569fc29b42c16e8962ad7a625cfb63f89df8367aad4e097661. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAGS2213837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a4fb828edec7f09578632d083c3c5109ceb70cd7172a1928f5f006cf35b3c3. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/TCAGS2221965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695d91fec2918e55f7fa8b3487a95a1139e3a7324d6703726ab814051c7b7b43. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAGS2205992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aab3d3a26e2f4765ef7f90687d523dc1ebe7ca95d351f11617ef86b55eb7d6a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAGS2213093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39476ae4277c7c5898cea1001649bf5992e997342e32ac911345d0e284a052fd. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZMHL2417096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb733c613a5768babaf52f42eefee7cd7e0b5d9c0a89ea6fd9466913df7e03987. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMHN2420894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce84aedd7c5231a7d71ab8a52abc9b3e347ff14c375a7ef78332df20f518e5b4. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZMHP2476224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88737fbf3a5157447764ddabc6e348a7b2fa86ded6d3f129ac3582ca8d370328. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMHM2452565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75bee3da2b65a457db1f62912e5c6bfaefdb83fb9ccdfbb059053c46d8980cfd. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZS672467435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77cb8edcdaa2e4de512d56bda2c628b0d6c53172765eb9aa75dc677bc6191bb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMHM2471211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ea715a9406d62d3b3837265be372bcb5bf5bcc2b1c8c5a0b1bced4d80cb448. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZS652470197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeee4e30cd81055d2b3efdd8d5ffab6735bf529be510244fcb983ec458bca598. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZMHL2468658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5faa34aa67da6548d65d9d814e5e9021013af826610032bbc8bf77f527b4004. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QM42K2531196.