Don Grolnick (September 23, 1947 – June 1, 1996) was an American jazz pianist, composer, and record producer. He was a member of the groups Steps Ahead and Dreams, both with Michael Brecker, and playe
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 0x1789fa8ba97d16c3c90b8d43e515095c44c918a717866a44a092f9771d48f990. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c5fdff0b-98b8-47e7-834d-832076784234.json and https://artists.proofprofile.net/proofs/artist/c5fdff0b-98b8-47e7-834d-832076784234.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 0x21dded36f4c776d13da8c88ed46eb36db40e59da31b629b3cf5154d71d64c0bf. 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/USDSL1004201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d36abb0db495e1969bf8fff5f9859f3eceb7c863b4d8505a56b2220937cb9fa. 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/USDSL1004202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7643e924c0ce711b9ff7d324cecfa577ec1f84bc47333f0486814867e21053d4. 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/USDSL1004203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe30b67b8b4191d08caac8800b1d4bf110162f9732299185aef40ac45b5125a6. 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/USDSL1004204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c6243ade8bc941ef42a50fea1428d3b4de5e7ef29793c5d24413d76b294a9f. 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/USDSL1004205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1b5121662eadf9bb8d99155a6f34a4bc414f56a009f6c8ba8414fa1c1066ae. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/USDSL1004206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7423c884da36892e742244fced123cff485b9629762e65574f71b1465b7f0e. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/USDSL1004207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae66f0ddd7718eacd92cf525148e098312a25be98f9710b0dad9d88825ae728. 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/USDSL1004208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bac7b7d6245b44fc8bfb7ab7acbeb3c2052ba8d9ccb07e3c2f20c0c228b5f0. 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/USEZT0610151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1fa36829e89417efb3aa5e48a869e2229f1eedd9b4ac0b2e0acf331915d8d9e. 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/USEZT0610141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5deb175bd5b08433238022ee7e555ba471e982168bf2aac66391e7d469bed3b7. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USEZT0610149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd205813f4e58238ac47bba808a6aa9c44feda81316ae21a437f39b5afae46304. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USEZT0610142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8e2de1ce0d6b1533433fd4a8e791693210381cf701d31edb47edda75801190. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USEZT0610143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162802ba14c2a76240fd61cb8050d9f709647432203fad74ff656f6c9f84b203. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/USEZT0610144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715a69b427042464d32e16f1107e56004665eb494c0c2ee1ed726fcdc86a0368. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/USEZT0610148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a6139dfa3fa58bb984e9e972e314302eb4496478084d5acc81a7ec6ef93834. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USEZT0610153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962974593ce77a3914920ce33cce11742b5c0188ddb534b91ded592649191d37. 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/USEZT0610145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8116906de2f22361653491f3f8864ac3af2ff62427795d47842e34c43067924e. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/USEZT0610146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17025e8352428f3c5836a76202a8da772c92feb46b69325f9746189ec107d519. 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/USEZT0610150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e2c2af7541730af0c84b3830e6b686428caca5aa5ad14be176abfa124dfcf2. 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/USEZT0610147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c59fb5035fe41c2d12ff337901ca731c43f60033798a1999465e3dcb18b82f2. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/USEZT0610152.
Itsbynne Reel/Boffyflow and Spike/Níl 'Na Lá/Toss the Feathers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fbecdda58b635db54d26abe27b7de60169dc0b3b5664eb06464c896b8f9184. 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/USBC19710150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a86221f36b528bbe31b47a6ad6916d96f62cb220526dea32f61fe19f776cc1. 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/DEPI82203432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5ba428040f10a7616355ab53f26b9777260268637e2b4fac46eacbbecf047e. 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/DEPI82203433.