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 0x04c8e307a01d701fe0fb9196dd2871b45730eb1bdca3d7e519654420120028a4. 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/3ead3098-170f-443e-96b0-daaa808e512e.json and https://artists.proofprofile.net/proofs/artist/3ead3098-170f-443e-96b0-daaa808e512e.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 0x9290100d7ccd5e322a65302aca0a5185dc716e1776580a590f043c36b08eab68. 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/ES75E2401042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4f721b084c812c1df70498845f2cec9ecb0d194d445021e744e0c6724aa81e. 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/QZTVM2341525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0a6ab690cb981bce33f60f543258f16085674e90e2c751d834041407e23411. 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/ES75E2303619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0d92412a29da33ec86ed9e575e404f739d8f5cfcc493425225ddf09006e751. 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/USL4Q2364842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6983b7e164ccc86bd5abc577732f030ec739ffff1ca22da8f4c82dc1f8d8a970. 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/USHM82053501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32add99e10b86bbc48c25d5e8b7b691add1edd7144b208d86b248d3afe8fb1cb. 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/TCAGH2271886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985070dc0220ea356a12931494ac2037fc032bd1d065ca413f5ceba4866c3965. 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/QZW9K2239143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbd85a39711fc33a1011d9a0df52ff8923f43c50bd1a45b52323d1ba9f3aa89. 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/USL4R2226192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5212dee13470b04c93725bb7a588781739a4052ac1b736a4b714c5955c36dd31. 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/QZMZ92375012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dca039bc5d5846c7a2f23cbcc868648d5052faac76970196aaee08e907f3a9a. 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/QZDA72326937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d00117d49eb6eff20eccf2112aa6854968fdbd20f28094831a69def2a212e6d. 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/TCAFS2131443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd463830eaa3c73ef4ac262bfc1d418c3b9563ba7dc34ba7290323bee4d8e6638. 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/QZHZ42173065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1e6cbd9b39785c728288570e3cc42c41b11d12eb7cffc27510c7f8e04d6243. 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/QZMZ92334882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b9bf359f28b8981608e585321ce152ba25df319835e15c310c4e4afe3edc116. 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/USX9P2003243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880d2d2161a745a3c5e32b71d6f29b4c08d25db034f8439e86d8817c730880d4. 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/QZNJY2343944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acf49279386f9ee2f31857c9b5fd568ef050d08825a8dbeef727209236eb6b8. 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/USHM22069518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9fec1e93b8f4d74a27daa937766bc1fbf6f365dc9f58dfd0d874ca3fed024a. 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/USCGJ2092703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a4d7232d88002ee47dcbf354a454f33fa0c43f3fa2f9eb8364e8a43d70aa37. 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/QZHZ32174383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfb61ab4ea2dc4ffd9dbde69e189ddc908e0e2da1016ae36b8b2967968e380f. 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/QZHNB2228200.