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 0xdfe30d71c28375ac9b6dca73b6a52944dfc1663061ca3765fecfdfbab1de5142. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7e87725-88a2-4360-8ea0-33370a294276.json and https://artists.proofprofile.net/proofs/artist/f7e87725-88a2-4360-8ea0-33370a294276.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 0x7198a47e44af55a5b440108abcbd9d76ea175eab17fb780d6d21dd4f772d0736. 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/FRX872278877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1bddd567f38c7a8ee834cd9107123ced8663faa146d330cba8470449b3746c6. 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/HKG732274412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602182c6dd7c0430af4a5e3b161601447813cebed18a9d30682f54fd7f4d8c55. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FRS182151468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6167176b52e118ed3692edd1441ec9cc8053e9a865266cf20e7f206a31f8406b. 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/FRX762179019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844af5f868b0f4d96f3052c7f3051eb0ea3fc7cd5bfab5623d1cf48acc4ea3c6. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/FRX282150109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x202b4544681d891883460c7a23270382cd6435c4512ea7c17c845ed4effbf057. 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/FR96X2102048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1477dcbc29ffad81e5346f97cd62e207ae9c735a796a7c4facb9a043f41a341b. 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/FR59R2114246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618ae1cf7596d83fbe60c8dddff7456dbac264999f82f38879058fa0e54b65fe. 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/FR26V2047321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49290d64ba271bbfc89692abef53f1351ac70774982f38969d1f0d9e6c8b85bb. 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/FRS182087189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb409045520956a5d00d1400915490af73a0ac7e673382bfc30401cc12fa3f53. 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/HKG732019041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb8d71daac4d2bae06b56a877d167bcce947f2ac6a57012bcfac50fd1d09cac. 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/HKG732118780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27311d36936d7ba77a0cc7c86ea9bde4cb29bbc5b9de03fb0f659d659a57f54. 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/HKG732017767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa422d59261f9d38b88f337511570e31fb1da4d903ce97179c8254fe573f8cd9c. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/HKG732013166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed43544ea8cf8cd24ec7d7c1d2394865d95b0b07e57c67a3716e71684946f5f1. 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/HKG732132759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835e6bda60df290a239620d3645e91a4dd7d5362f3bd1123416a94e9951a37e5. 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/CNZ632100963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9eeb45ee872945def0f27ddf17c35a4886e3b75b67f3d775a99b2df5eeade5. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/FR2X42390799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb6b36ac8275181201ecf36945adce3ddd867958c9b341ef6d2080dcf786156. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/FR2X42382173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf844e695afd9c2b29f3e48e2c7eafd4bca3f625e6794b17f7f44fab31c95d8. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HKG732013619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c9208b86658e735327b8fded668e8f920b88fd667bfcbb0eaed085fc05d908. 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/HKG732020848.