thumb|A road sign shows maximum and minimum speed limit for different types of vehicle on expressway in China. Speed limit signs are shown in kilometres per hour. Speed limits on road traffic, as used
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca02c18d39e6ef46a96465479a2e15f2e00023382c7eac99fb84503b4f62162e. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3dcb8d6-9c1f-4e67-9d1b-ace62733e27f.json and https://artists.proofprofile.net/proofs/artist/d3dcb8d6-9c1f-4e67-9d1b-ace62733e27f.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf979cdcbda8b7aa6b8276bec1b024a3fa4e41826e5b4d4b3e3497410452f58d. 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/DEH742401255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b27cdbbef3e567decb717f82a8ad98056d009c49912bd84dba2af507fe95558. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR59R2320241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce54734cca21059e26e75ca8258d4f59f2e01a9dfaf23149892bd3f01e93007. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR59R2320243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x662153463dac658eada2243404213e5c11ee4b90d9bcaa5ad10222ee71291c6c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR59R2320236.
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 0x1373ce0223e4a8aa710322f48c6f7285b9d93adc64be9a18fe038b6e8528da45. 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/DEH742401254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963d03c50f4ff822060e97bf91c0f5603e4fec46259a2a06657f9b0aa204bf20. 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/DEH742401256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3549a1ecb44dc88ed9bf09ed57578975363413170dd36317da33ff7a233816f2. 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/DEH742401259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb14289d80d5ee984888feeb261c6bfb88efa68aceab6526d1cb38fd61944fe. 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/FR59R2315727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b58d93403f63850667ef2da0bea0e31f64be52d9119291241bfb99b40ebc40. 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/FR59R2315728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f03758961df806bba333f7e16bea8fd8e322c71727e8ce808e29b869f646c1. 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/FR59R2315731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x305c22f3db80ee9c208efc3b5f709e2d411a556fb505e64b6c5b81a00d1686fb. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/FR59R2315732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43e72ff6b0a4debd52b871a903bbd0d3f9ee5a59c852f919c07a8987d07b65c. 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/FR59R2315707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de1ac3ef325218b6dd934e69ec75061daf3a00a3400cc0acc7e734fedfef559. 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/FR59R2315710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f8ef44fe8c1e341528eced2d0a48d4d28b8f1861dd05a8e1218f22b412960b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR59R2315712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c27c699de683f9cdc36c35866b37ab9aff1f8291cbfbee3119c07f178d2a4d7. 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/FR59R2315711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4a47fe907d31d58251629ef143124cde916d69d00c95b47eb9c795c123b835. 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/FR59R2315716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f7a47e87f0cc207c321c21fe12209971fd4ae563e717750a8fe09fff98f2fe. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR59R2315715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe337508fd789abc5e3685a084edf0c50ec20db0de1704db6af7770fc28b2afe. 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/FR59R2315717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3b8cc04c6aaf2a3dbd97d69b8edb4ef45f4c1a8ced3118ecfd7a1a701e00ba. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/FR59R2315719.
The Broken Record (The Chorus Soundtapes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe087435d38f1d2c4760190d2beca465903edee890fcc15f83239c074407ea080. 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/DEZC62388964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7be14e25f5b636b9cf5ec767f49b16e0c87c8a47f23f58dc57dd427c129451. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/DEZC62388962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77fa84e8db56b1e77f930d8669d4c6f7bc2f704e431b9a86902ad888a35386d. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEZC62388965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a9fcf75e56f2be15a9756aeb96043a08f0c752697fb4f39e8deffcc22ef04b2. 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/DEZC62388971.