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 0xcfca079cad2edd02d8f625118883b94ab42bab0d4fcfffa12ba14512db772a83. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5483c265-bb83-4968-af0e-274f04305bd6.json and https://artists.proofprofile.net/proofs/artist/5483c265-bb83-4968-af0e-274f04305bd6.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 0xbe9418dc9a1cef9ed2b6f30c22bc05211d9bd42d840776ef5e4e4abdc20f366c. 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/USHM90792643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406d63eba133f5a0afada8d44ab6e85c183e74f138dfb276ac277f5216f9b1e3. 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/USHM90792648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e7f011822b5bc43950aadd2f3848655163fa330dbb266bcb7379a0e897102e. 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/USHM90792649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa9eafbc3582f014366dfcd0540cbb7d494e049a9b50552b3f11249b46ef2fb4. 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/USHM90792651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1424a60867c92f47dffbc0fc2c5b8e7358bc629e0c29b228b1fba736808b58. 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/QMRTJ2400555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1feba875bd453067fbee160c894544e7b008542ca5e6fdeeb1f00244457762af. 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/QMRTJ2400556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ec4cdab2233c32d9b650211041d96e50126f1d88312dfcbc70706d539a1c1c. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/USVPR0713878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b67766f2518b80eadf541227b24964812f2d143817179bebbf695f4a472d4dd. 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/USVPR0713879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536de8e45314181d6b344e430a63a6886887192aa405760bbb64aa10bda6cbe7. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USVPR0713880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40630ec4650775b5056f6e79c7267878846675f4538cdd807eaab4d07f50fce. 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/USVPR0713881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4413cbe916d51d793333f379e5ee75ebf663808f875bae89384cb9306de0d4. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USVPR0713883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5cc39d971d4abdca0a40739ab5044d3309106b0cc6189d9863b7e7af361aa7. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/USVPR0713887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df1103639dad261abf452f79f9c5761795fd732d6a0d7f85098931d2d01f017. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USVPR0713889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7a5e9a7208752527be832585404c15c5812445e06de96f7fad527c91345cb2. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/USVPR0713892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b47042197989f379cc4a1a7626e970e5f7aa7c82db10c3d82bcc7ee73241bc. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/USAT20507136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0b5cd84533913472e3b81bccb55a4fffbc8c16af1b3a7078a5675e918a6e6d. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USVPR0511241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71c24d1537e128b72f8bf25556919470d2942e19e46bc0e582048deb47db337. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/USVPR0511248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ce8f402c8d8fbf68273e3be1b52720e7a61ad832693c8c1def778e5945c541. 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/USVPR0511249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8632251ee4bdc6ccf29ee352f699ffda5b0bf0d9e7cd1bb4780474a614170ce. 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/DEZ650700961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebdc6d11bf21ec3014f6b5d1dda1b9c00eac4eacf80b32e986e09d2a45eb7e7. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEZ650700971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58a3077f2d820f45312d713eb7b0ad59cd03ad7c9d92c1851152fd7bbd8ead5. 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/USTC40889387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048232a556009f1a7fd5ab3e7107e627244e3991e5773eb67444fe998e776a46. 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/USHM80607756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4229bddb1b49e8b2fcda81569d06e295abf0463ce18eebc6a94890fe5544fa5e. 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/USTC80934442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3304aceb6e58bbf8f8f729cb6ef9a8b704d236f0a82e6e5dc8e4db2307b26774. 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/US7VG1722103.