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 0xa76acab4b1d8d016f4f53a71aa94eda6fb22f15062067089f62fb248235542ff. 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/c9ce69ef-4948-4890-9e5a-affbae7f949d.json and https://artists.proofprofile.net/proofs/artist/c9ce69ef-4948-4890-9e5a-affbae7f949d.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 0x4a7956d0f29e90badc319d7aa9e93443bc25a91a6ad720758d1547629aaf4cb7. 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/USL4Q2476499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaea2ce17a189b61616ded064d7d8100720d2b4cc0d1a41e8afd8568c3de07fa. 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/USL4Q2476500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a20c98cc8b9675257b2f53e8d74a0ab1b7babfe36c33b0ce1e10ac90bbac35. 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/USL4Q2476501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547bfe13c3dd4dc29f35cc8e54b6a969c3ee96ca177b0eff501a633365594c97. 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/USL4Q2476502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3885b38e477e4d99618f73d454fc79058a9c243faa9305c8463373f349fa23. 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/USL4Q2476503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0ea0b13f7c58e52c729b486ca2d35dcacc02aec200e72a31a2d5bd8da77b18. 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/USL4Q2476504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8385a5888ed3049b819e81aed668cba9e047e10938851673df849be798432b6e. 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/USL4Q2476505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7610c094dffb0a8f467492641bba1e000d58aef244844c552be6d1cdbb21525. 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/USL4Q2476506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04769d34a5bc247355188efa23c6b8bf178a8d6d6bef4674b88c429386b2cf58. 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/USL4Q2476507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd757c9d042c633e929346abb73c0a317cde581f3ff2147e735fe1ae56df1531c. 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/USL4Q2476508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc147fc76962f30b8e17e85e1207e9eaa427b9a4a5b1f12750a9f0d5e5e6a0cda. 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/USL4Q2476509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc3c1c77538efb351c0dfe5ccfd06386e88117366f8946cfa9cdb20e05cd093. 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/USL4Q2476510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96bed3ad55f81e86b5d7a4f1d3a3b38bfd10a5298ecd931cc582c24282300db. 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/USL4Q2476511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1770449c7faeb82c6e1abab3eb645c5429be5e0eb607affb4c122fffd23a9664. 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/USL4Q2476512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc02c0785e4a856fde4e9aa62e7ee3e1b3d94b6d427ba65ccbb84a71d2c2373. 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/USL4Q2476513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab3c440485138612307b47ef8e5377b109559930a2a9a84587367dd76d50b3f. 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/USL4Q2476514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26da8d26e24006117e9efd7740f7638fbff9f5bdcb5a50b5aa232469c4a85c8. 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/USL4Q2476515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fe9f2193e25f4b0c74d488eb5b87c7f1175ac030fdcaab7a26de1bc3ef7c2d. 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/USL4Q2476516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249152b2e72eb17204f780a15011399a37b2cfa862517e0a934cd9652901253d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USL4Q2476517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1abb3576c7d1bf55a417d5e334682650708e45d8f5d984b87fc54f009fd38769. 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/USL4Q2476518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e54100d05e47156c1a2e869e2350a0dd47af09576dc593ff0eb61dab7254bf5. 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/USL4Q2476519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066f9d70e2307e1f4eef340585d3da39ae41d82eb82142fe9342deee70a5c428. 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/USL4Q2476520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf39d94bd578827f3bf59e69ead40b09489b150210fa1882e6afd74e2a2402a. 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/USL4Q2476521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7703713e6e984ddcfdf4c786a9f1a2f48bf0664402cf3fc34c93bc4dc7e754. 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/USL4Q2476522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a99cd69522150812cc251f315bdb49ba42e2a92cb7791996c85b6ce936af90. 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/USL4Q2476523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbf9cfed0d91946dcb672e7b2402f1d7042315abc3c5ae82be8658d7592caae. 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/USL4Q2476524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef21bcd670b61ca90fdea7f5a7dd0c073673035ceed47c26ad2e03fe5c14ba2. 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/USL4Q2476525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db5c38be52a64212c79c6b5004dd41781c79e2fd8208ae5f4e69d0279f57ee9. 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/USL4Q2476526.