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 0x758573267db88e0dc7434db60ae57bbaeb6b41ea35f45f1307ae0208a7e97cec. 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/5e6b35e5-c9b4-41b4-8693-1f1ae4e26e4e.json and https://artists.proofprofile.net/proofs/artist/5e6b35e5-c9b4-41b4-8693-1f1ae4e26e4e.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 0x78c63bc28c826c38dc53fda01d1c8e643161b6ada394bed1c6f741779ed2aeb8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNWS2095097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae6a0b8c9b749a074e012dbe80c8195e592a0cf0520ba74ef9cef211daddda3. 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/QZNWS2095098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4492b203bdb7a7d038d433bee56894ea414546e749f038c0915a59fb414bd708. 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/QZNWS2095099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3b4793316586c8df05f52ccd20606b6dffb0df48321c6185595623e3bef6b6. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZNWS2095100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe2c02c49b4c7a1bfa21d303e69c5eeb8e6678ad2f480077428c5cce9473dad. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZNWS2095101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9826472dddb259de2791ed84009fa3b6244ff4798f00059b2c4840c0e7ead1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZNWS2095103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa279e1cd8775666609206858faa39a86d5edab9da99492ba369fa2b1944a47f2. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/QZNWS2095104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0525c9466cc9f27940bfd54b1b09e9264a16f5dea8bd51b78f0aa999a228683. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZNWS2095105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b9f63b1efe66e6aadad746fec146b7ff2544e03d9e3f60c4594efa24c9a4dd. 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/QZNWS2095106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e4ffc60dd73d532096f05f664798fec52918636f3eb4a70690644709d20e0a. 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/QZTB52334397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc732354b9fea55a4fe034086371894e0a80814d6c2da5bc35861314176f79b. 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/QZFYY2022857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d81543dea33c139e5d576fb723416b8f3bfaa90a7c2c5fdbc900122f2884c7. 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/QZWFL2341945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202f7f2e5b6e3c8f9f17dbc541a2f2af094de4fdd8f668f4b3867837fa543af0. 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/QZWFL2341946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab865cc458fb3b02c5d33c2db9a1add43a36442bddbe32cceabc19b61a67a519. 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/QZWFL2341947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece4b76959cab9bc16df9edcb9e7a46dde7da275a8335300aee39d63087e6d4f. 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/QZWFL2341948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06c2b025596ef66464877bc053bd9e8284087604e4a75fc09e9e1baa531ffe9. 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/QZWFL2341949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41408547f2aaf251b8f9b5a075ec59e917a4a6b6e260d6b097ccbc7036bd211b. 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/QZWFL2341950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d4829d2c68f8ea01bdfa2458de2bff6b233926521b446b4f48c9e0003c70bf. 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/QZWFL2341951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c82d7fa78719c3ffa2eb898a699a185fb1855dfc579ff7521b788548709ff9. 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/QZWFL2341952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897ce644194adfd9cea468d0f78182afe6f12e2392140cf5616de2c0deb7808b. 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/QZWFL2341953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x402bbf80cd0672a2db073309217e1bb4195441a8a52351f5ab307df85101d891. 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/QZWFL2341954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0696fc651d559e11f046ce7ffd7feac1efac0ef0cd43c3f1778891a933dc649. 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/QZHN72377322.