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 0x2837cff1359c03b0926248a55a2ba7cdf49df9d77d15d7b2b27d35f1a4e5b9d6. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/44e1ff2e-d9fb-48c0-a89f-eff923679d44.json and https://artists.proofprofile.net/proofs/artist/44e1ff2e-d9fb-48c0-a89f-eff923679d44.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 0x4ce74885edc393c8a251ea8f46cd23f4ce1783cf4a9f03ecb12f35d9435c5ba1. 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/USL4R2210951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6ee5688633fc4f3ac0c36e3a9d7020adcf510b4d6d1a35f1da4ab326d8064a. 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/USL4R2210952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cf5bdf8dd96c2e4ab4d55d66610a344f5e14ba2cd4042d3caf3a62cd5744df. 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/USL4R2210953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9258fa0174aa5e46959cd9fe08308a712905d1753a1e3afabe65f2aa6c932c03. 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/USL4R2210954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03530605b333400754b516a217ea982bc9ca5633c8d81b397288b9741cae92d7. 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/USL4R2210955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248ffb082b33f8fff3bfb425c7e328ce70dc02e83c355673d596aae4bfb475bf. 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/USL4R2210956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff0a3d8e5f2ea1153d2c081f38e17a710ddf41c4029b6ae03cc4e71c3aee57e4. 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/USL4R2210957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e2ecef7ec3de784a66ec10e0544a9f4fdadc32c3c8090701895167bcbf8db1. 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/USL4R2210958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3bc95453c21484639f09e0aa9f5aadfc527ef31191dcb87819dc6237ed55099. 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/USL4R2210959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0cd856934b0e467bacaa0f1cc67022978120870b1e5ce5894bbac8d0461d06. 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/USL4R2210960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36b41c3580a26e737624356da4b1f6f847a99abfd5b56f7e46f1d821e7c95a0. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USL4R2210961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827b90ac63ebeb4e056485a193f3a420f667ada6affa6595c92d564bd71c5289. 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/USL4R2210962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72a86724264d4b2c85d50905b1ae4b8e6f7d73d10a295f7f6f7cbb2b9e5f89f. 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/USL4R2210963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787ee12b104c78a1ff5a0b9ebc53f107719fae684b464e3f395de9555f294a5b. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/USL4R2210964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164c42475e1b76efdd3b179b20ea7bfce4970aa7b44cc14d0b4b2a6ee67cba14. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USL4Q2084035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84be26a2cfff59fcfb4a5b6e05a650847628b57be3271468eaed3bc265f3d45. 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/USL4Q2084036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e2b712373facb36ee8226ac7d0295c818f0b8e56216130e1eb48c91f1fc174. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USL4Q2084037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed5509f9ba1c896e29ffaab468449dfd1e68e5a9efe2f64a30935bfa6476e87. 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/USL4Q2084038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52e75818f156e3352ba63c2e84bde9dcef1f743fc02f0aca7721a186aa61455. 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/USL4Q2084039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6291a186b9c9708a1aa3949c0b70a010b4f76ba27603c03f4e5404b651a17be8. 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/USL4Q2084040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935eda9020fa4644b676c45cb33b7d69f9698ce44dab595da9b5222bd1d5ee45. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USL4Q2084041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4802bde10606500795b05319b738f5daa3392cf83b8f49c161d093901246f57b. 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/USL4Q2084042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4c302cc97a28d126237fcd63c9bac481b2f1321ad5e2d640a982becadbec7d. 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/USL4R2216188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a56c8d063baab6c87fd57cf12ea9bfc995edc84c5e92c27d5cb9411c48f3b35. 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/USL4R2108956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bba10eebc9027f7507c55476ee440810600d7c12a543c210c03090985c26085. 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/USL4R2056086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44bc4eb839076a06b65c93e337fe29ad55e746fbcc7239f3262dbd7abe30063c. 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/USL4R2056087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da08f27b7c892783a96a7bbb94162dce2494192bb1d4d3a78e133cc5318f8f7. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/USL4R2062492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60b47754cf248d2a109425ffcf0e8be63f505babad051201f7d8e90995252f5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USL4R2062493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef771f9aa57354dee4fad547a925c8d6fcda5fff8c58e78c1cf357da9e29372. 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/USL4R2062494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2300cdf5d55de987f73cd7693c5e45ce05b27024ed91986f3f1ee322d402a2c0. 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/USL4R2062495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c7c465fd86c9d59add5f946e953ddec6d7e4da689997e40b5229ea65c2239d. 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/USL4R2062496.