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 0xff136bf4dbc4fc4c23fa29572eeddbee0c35e546a51c752b555ae15242d91e61. 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/82c57a9f-476b-48da-87d2-19ff98961967.json and https://artists.proofprofile.net/proofs/artist/82c57a9f-476b-48da-87d2-19ff98961967.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 0x94d3159ff0b7ea1983e7c49ced041fdc184d5121dba0b6a47f8053ea2667d19a. 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/DGA072427765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31bca89955251a5889e7050c9a4df9288c78bff3d4c869fa0b1eef298a46757. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKG732410480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1148827feeee83c4975746987ec6554dfa2ab0d6c7b090547f5639316e0023f. 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/HKG732410504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d32f97d606338e275132c9bd578328f1190aeb56036c81a6a592314eff6a3b8. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FRX452489581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d7159b3a8d2934b546f222a74df1ce5fcea1a1249593a26049b55851f5f3bb. 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/HKG731681252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a87dfd4fa3927493ddb243732279c7e53825a92a4455bf3754e3f3cc9ce8273. 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/HKC992325702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc6eeb3dbeba869bdadcfbbf201dbc3162fd3ff9a6dc3987f1a44ad2256583f7. 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/HKC992325902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae45b7078ef98b84b4d2d61511c93ff9188f1d83eebf40eaf1d6f20a9e09b50. 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/HKC992325268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40dd7f5754360bd595149790c24e7f58a5da184ff33c2b5e9f7dbda38df2a103. 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/HKC992325395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe23886ac1b2399c813012d3bb4803f344e659784b6fb1411381ed6b0c26d3fb4. 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/HKC992325285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb190f032a838e15341c458e5eaa5c0142ba4b82a999a69a8d8472c410683f8. 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/HKC992325267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d012ac3712bb090ab4c42d2d4d15208b7e85fc226cdd4182fe67cb4020f387. 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/HKC992325227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cee98d05cd4afc56704c7bf6616591266fe1c2b16941fefc200305bdd66487. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKC992325143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f3223013f27aff58a28a7afb491427d03a2c156891c1aad9b5c5604d5f753e. 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/HKC992624106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5342e720d65b58f6cac2c50fe86616226bd5b4802b2b8232e6d5d5a00afe749a. 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/HKC992624096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e2605741a4541865d2ede6df352a483441dfd708012fcf2a3c6cc34c7de976. 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/HKC992525256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696b00a77d305be6e19433a29859a04a103fc62a4aa0b8614a58ed2abe5035b5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DGA092470383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491d4aa511d3eea7931b9037c4f19df19843f4ca9c46119b5849aaecdc370ddb. 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/HKC992324172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0865a800988f33cc2558e7c506f7fb6b94992a83aa5fb258f54af78b286527c. 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/TWDL72300736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274e206511ff4c81e9c367e8466625ca1aa863d99c18c9a63186e1d9a2bd0ab3. 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/TWDL72300890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256f5fbb6b7a21bda12356007bb6fbad373c75778c8c79f362c9cbf96331ced7. 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/TWDL72203295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb970086dbf1abefe04d8f1ebe02db9e48272fe25bb7e1ed3de0f330f6142f76. 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/TWDL72203511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952ebc209976f79bc2654c673db361ab61cdb363bdc13c93c0be2712f66062be. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/TWDL72203197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c7b83299c57c86e4aff42f29c56c84ada9abf51479f10abf2458b18bf0fc15. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TWDL72202713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefefafd04c9bfe1f840e8e4de214b585d56529f52aa28c750a40cce42d0c9d0d. 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/TWDL72200091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb0a652a32ab2a27f475bd2846c0707ba7f012deecbf90420a43822e640648c. 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/TWDL72200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc334a9edb8d10827a8e0eab100af57d6913edd23f2f5ac9e7498899e6554a94d. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/TWDL72200233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f1826f1db15fcbed84e2af6db4c60d51d3baf059446754b5267fedcd414bc3. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/TWDL72200291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9deef9dfdfabd0927ae777792c15e8f665a9f3b062026e03d18466a7e27e5bdc. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TWDL72108405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53957263b83c6550516a11dece76463816b40fa5b60e5353cfaa22e16990d3a. 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/TWDL72108941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a3b5fb48dbb2cf10830d6fa27cf45b8e2685465c44b2f9e0c8e25f6ca63c54. 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/TWDL72107708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc97165e277ed8a07a00f241663c32ed35ff62800e9dfc3de608d91ee5afe0e. 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/TWDL72107669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0913b06e86e8ffab0b95ceeba4ea218e0f76f02493f757c023325c6bd255abf3. 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/TWDL72202031.