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 0xa2bdd3b060950248994475aa67e3b42b6089a40397a317dfa01242f87f15c838. 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/b5baf90b-d13b-4260-857d-6980dceccf20.json and https://artists.proofprofile.net/proofs/artist/b5baf90b-d13b-4260-857d-6980dceccf20.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 0x763b498bb86126aa3a2f2185a2e4b6ac6791a839ff5fa14ed53424d12059e2c0. 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/QZWV32446907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x377017fd823e977b934e886167b8c1cf2ce93f6dc691a561e8eee78b10ef8a2a. 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/QZWDE2426394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4fcee0bafcc966bc346fe7c317115a5133ee0066a64eca30201b819101e9a0. 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/GBWUL2488535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f99b69f0341b1d37af0ce4fb060ad98532560478d56591ea523c7c2559703f. 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/GBWUL2406999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25359f5070a47b8c2c70c89abfbffbf42329af82e97b2114e924a711b6eca571. 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/GBRKQ2417203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081325b8c93855a5a0dedf7cb071a82d3758156509683dc67c20fb7844930843. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USLZJ2488798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f452bf242c910ebc163e41e48d18318c3ca0c076ac84fda7d9cc2abe3191aa1. 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/USLZJ2417230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x229e7a4864c009b5cf25ee88758436fc13f7d38f1acdb5097e1b96a4eb5c1e55. 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/QZ5FN2472763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e872e5e1e288705c4707fdf050ccaf26ca6c5a5af0bc459110d065f8c4ebc9. 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/QZ5FN2422701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17c49db0ba36c99794490c757ccbcec7937e82c9b83bf8161aac15cbba02076. 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/QZZEB2378096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef6be524b1654cbca8444909829004cbe219b08cd811d5bc1c363010f7bc2f6. 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/QZZEB2329476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6af385e91e6a70fa33f3e5ad91ddc4f627da54b3f2303f69de0b73ba102460f. 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/QZZ8B2369846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f9e46e4e702f4b3fa4c0dad1c398b2f4ce3520f7824a40d968d801eb85fc99. 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/QZZ8A2366543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66496fd9e0881b5b2b0ebf8a0f1a88ba201a5162d5866fdb923a8856ef56de44. 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/QZWV32387380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2e1deba23859903fb7c447b2284f0ce41d2d8f4c0cfa22bfb0d10ddf9ca6b9. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZWV32320760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd86e4acb663154c1e361a2bb3a2b5e42b5aee04076ad11947b27606ac0009cb. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZS642318816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd896ffba4e4b7d082568c0c7377902a867d7488fce46e3c5b6655caf68a5e306. 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/QZS642384461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x453f664243d4084f08621d76365e76fdd0b5f7bcf2ea166eecb64d70863516ae. 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/QZMHL2365883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1e94c50b150b720e1e75866138d6cf897f78cc9ef43f5c603774e2b439e54f. 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/QZMHK2230050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c485fb8bdddccfcb5cfd7f92bdb85ffdd2402c142dc29360351a64ffbb2cc8. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZS652258747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966843ac9eaced26c632a122807ec9609aa1a431ffbf55486fd54a576f8b9b97. 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/QZMHL2260029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c7c4d8975ebca2bb0c81b15899b42c368b640fe5fa9d2925b239fe6b7fb5dc2. 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/QZS642282727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc6b22bc89a20b002b25276e3dd95c976ca1055a6c4d26bd4743f2144d0713b. 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/QZS662253998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d2a4122914f1351b4c78ec4d888e37efcf246fe56b82e4a7c083b2d34fe432. 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/QZMHK2252508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7922bb76935476db195070d587c06371b5ff07c3ffe2f5bdc48fb87c07d013dd. 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/QZS662217645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f56c9ca8f30b4d5174e1d6bafa9541be3fc1c491272552e9e0c538bffd7be3. 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/USA2P2237769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6695b0af21a3952340876aec133171c55eef7f2004c8a4b197224dcca3842d09. 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/QZS672288423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991310789d6a9126a53cb8c346b7e3314590ff0751e6b76e06a0ac15ea5da012. 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/QZMHM2245433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4cbc05b264891e4f60886603073ea04e5b8ce331f23c86a173491eb51e9192. 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/QZS632267147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8506cb1dabed655e99a6adc69076836a4795616384b2426cbf85c82ce1e6ccd9. 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/QZMHM2236895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7812c9d24c5298662458ed753117882f8d6496bedd826514f445a22e0a145c. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZMHM2203074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f94fc85d6dc76ebf4cd0323afb6d4982a505965e4837e7a5d7588be5a901ff. 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/QZMHM2238024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22bb58dde285a9109ae8efc5c44ef001a90f910f39a2fc83b32ea45308d249b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZMHM2278063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6a2eb1df2d0dd373f871739da4aadac371c0f8aa1d0885a1ed098e0ef1f9d3. 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/QZS662248569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7c6964b67b09c5720c35f5db2319e1794e24151342971e74b57c13deee08e8. 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/USA2P2207583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c0fac044e025eee4a39078889b3fc4fe82099c8fa04d5e043ad253c531fad1. 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/QZKDK2260242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17bcb4b8ed5b0257367197054b96adf543c309c48761a6ae57e3fa6fd03e5a6. 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/QZKDK2281002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e419e0f6560fa469a6943e7a5ef304b235083203d2c85877dbd0b8dfc82c7a. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/HKG731867845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fde0770924cc94c6405ecf4e51e7ec88d15c15f650860c1813bbe0a7bd16296. 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/QZS632191068.