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 0x880a6565613707c532f8803186fb0d16e5ca52eb0d5949dc2ce6776c64ca8de1. 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/62b0084a-4e0a-4751-932a-71290780c7c4.json and https://artists.proofprofile.net/proofs/artist/62b0084a-4e0a-4751-932a-71290780c7c4.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 0x3e600e7ecb6832a3e382615ae45e6c98c51a6fd2d4f51ec57b4ecd4ae9304f0a. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ES71G2055610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f085ebbb6652dcc3ba9e402141314382e1de23b7d32eec45170f33a6ab6bf6. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES71G2055578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea64ca8c7be99382947f33e15d2d0dc23d8bb8481f8a076d5ad474a20df55eef. 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/ESA012026685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf12eb698fc6f8274570718ad8b180fdb49f24e45e18bea3bccda11cb2503d59. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/ES71G2055580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4bf38602232410781c16f53354643f6174504709b9b6cac96ffe1273d8064e. 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/ES71G2033690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6837eb2c553210ddfe6642a1a4957b01271d0e5b33735f5ab28cc011c80e2dec. 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/ES71G2048862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76eb1ca2d11b0e8c3bc7d44c39951279aaeec5d43ad4f816578ae75e67d8fe98. 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/ES71G2055583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cac783a14cb833dd30ff42ae03faa0562e754e3fbd90c073c4f39a58ad116ca. 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/ES71G2055584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc100680742e622ca9ff3c02a34d90b84badaa22f8c0c7f800c6b0081ebb1ac84. 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/ES71G2055585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c98022c05801ee262e42b56a4b2b03c9809733695510b20ad18f919fec1cf9. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/ES71G2133564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5a3dd66173c16e24de2057387e1eff96acb97e16a6847c14555eae7be30523. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/ES71G2324375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c0234035f9941a25e690134aa8d08252e12055e73be3b5ad19791232468ad5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFYY2419168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0569fe0a643b71c4e887bface5dba25de83b32aa2e6d0669cb3a54e6f817eee5. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/ES71G2422530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93748b99e123e0787b851dbb2adf76e07a58e2c7e5c57c4ab0a25fc9916b177. 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/ES71G2422807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b102ba7fffee266912cd015fbe48a97bb06a2a8760a48086cb635c4e5eb6eab. 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/ES71G2423730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c80d5bf0a088384cc1d78709b15624801ab47625530d4e79c423aa1005e406f. 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/ES71G2423731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6324ed5b4556118eae21ea970a9f0e2d1df9485f9080efded39766144f8c63ac. 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/ES71G2423732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c1355d6e30e53a998da285c0646d7dfe58b9dbb39860b7d5066d481b8df735. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES71G2322552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82f43143d64a1610dd9481154190caed6a28b69ed8c99ffe9fca6a63b84eaa1. 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/QZWFK2324292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e236c41e68842c9f9487b56d454ea773ea1ff4ff24b7fedde309e0c6d30b78. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/ES71G2423733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c6b6a163aca7396f9cf1074b79cc029960646bf177081655b812bfd57b7e09. 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/ES71G2423734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3fdee86004160fae8ea2d07b5b7a65489e80081950740de216d3599cdb831a. 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/QM4TX2085608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b330e536839285f0f86dcb4f8fb9ac8e6d675acc5307cc6df9be498bcfc9461. 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/ES5592200490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815d7742cee0ac309a75a7d3efaf0f17081b64583cb102bd893f9b2e55b1f555. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES5592200502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f3fa09eebeb0e9f37f2c218e8e9df446ca30095702148a86c120d80d416db4. 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/QM6MZ2585632.