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 0x6c3e4dc44fdefe0dd402c28a8df46acf0ab74aaaaaa107fd364119e778eab724. 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/e79678a9-0860-44c3-a604-42926c7a09d4.json and https://artists.proofprofile.net/proofs/artist/e79678a9-0860-44c3-a604-42926c7a09d4.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 0x4f0a5d3ec269f00cd3f48d7bab8708bea4042268d1e80c22f3928d2015edf67b. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZNWQ2234684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69e25f030b9c791bb1225c4e4c9018841c5730f1b73069bc2dd700b80d295a4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWQ2234685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a767caadc5d9e6adead70f8a36cb68ede196774a945cb6e3519faf6ffdc3bb0. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNWQ2234686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead2bfad4a1e07124094c9ec0fadd293cd878d323ce9ee7392db3882da8b1c99. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWQ2234688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af9ebe451fa84f290d1aed078156a3e91cf3b91cd184ff3fdc4bcac0c3fb272. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHNC2275458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9553053a51bd598590b315f46c95f90b173441bbc7fce4bef65a51750b315aef. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWQ2234689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244cd90de593dccb3a31b7fb301aadb2d53f81349239c8c9aafb4dd2ac673401. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZNWQ2234693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd06560f9b2588ead5744a0613d76f4252c522aca5c1104df802d360854bb17. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZRP52392573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb605498eeb1ad6a01dddc4a889f80db87ac4447952e8eef54b747cd33f85593. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTB22397327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710dd32551d34c4ef4620faa4c129060c97d1338a99c64fad90dbcade878fd49. 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/QZTB22397328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde6c1d52f4a6ebfc72c36f08d424810ced67ee97f103da87569cd8e0a2da9e5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB22397329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec869247b71fdd212e3faee868fbb0a4cc3f0475e9b9699bdaa7f245611ad1e. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZTB22397330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bdc1fd74472bc3a49602a7c134c3f31b2575bb4f12b3643ce44844e162b9c7f. 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/QZTB22397331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335e7dc17a2755454bc293191567d5005a4c8c6158fce9beb5e3a32aeb2c2a57. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB22397332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319769fd353877fb7f934a0ebcce008201a3adb14267d581b88184b35a798edf. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZMEM2304820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8630b916e7eaa8524357b63a37bd5a4a86ee9a81f4975d5031aae6fc02ed339. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ22370578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x891a53148edf3136626bf74c4485acb598ecbd05585ee7a9f3225482f9564675. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZTB22397333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6927e81f5af0669936294aaa006e5cc69f48814166cb2dc9e2b939095a2a17aa. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QZTB22397334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64126529171e69d7ea33c8592a8cf28cc79c5fd6b4c5549cd642df2c9a2fd4be. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZES52395411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059d76650db4f40e09513e2812cd7c8f1499b5298ce9e423dfb2873ae1d37588. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTB22397335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865df47579f489c55fa9bbb5e9d8bad5b5aa027815d34753d38eccf4f3bf05b8. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZK6G2433417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76e9134e79bc3277fbbc014c1e7e7c3f8a370f5bda1d0c245b87cfe22c6cf71. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTB72472774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b14f9b9d47e0278e38f62e06bdc7a442a2e999b24bbbcf2199867e80b2c0c2a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZQAY2542428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79491ffcca2d05c10a37f8e6a2eebfde3b131b7d989841c655f002641b1846eb. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZQAY2597144.